Diff of the two buildlogs:

--
--- b1/build.log	2019-06-14 13:21:59.005702654 +0000
+++ b2/build.log	2019-06-14 13:22:46.255507290 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Jun 14 01:10:33 -12 2019
-I: pbuilder-time-stamp: 1560517833
+I: Current time: Fri Jul 17 09:44:59 +14 2020
+I: pbuilder-time-stamp: 1594928699
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +18,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Thu Apr 20 09:23:33 2017 -12
+gpgv: Signature made Fri Apr 21 11:23:33 2017 +14
 gpgv:                using RSA key 058051A76AEE285679C2260C7B7B40AD0F81D93B
 gpgv:                issuer "diocles@debian.org"
 gpgv: Can't check signature: No public key
@@ -34,6 +34,18 @@
 dpkg-source: info: applying flex-2.6-compat
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/27813/tmp/hooks/D01_modify_environment starting
+disorder-fs debug: Running on profitbricks-build16-i386.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
+Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
+Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
+Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by bash'
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/27813/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -146,7 +158,7 @@
 Get: 67 http://cdn-fastly.deb.debian.org/debian buster/main i386 libxpm-dev i386 1:3.5.12-1 [107 kB]
 Get: 68 http://cdn-fastly.deb.debian.org/debian buster/main i386 libxaw7-dev i386 2:1.0.13-1+b2 [276 kB]
 Get: 69 http://cdn-fastly.deb.debian.org/debian buster/main i386 xutils-dev i386 1:7.7+5+b1 [244 kB]
-Fetched 26.3 MB in 24s (1089 kB/s)
+Fetched 26.3 MB in 2s (13.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
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(Reading database ... 19231 files and directories currently installed.)
@@ -447,9 +459,41 @@
 Building dependency tree...
 Reading state information...
 fakeroot is already the newest version (1.23-1).
-0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
+The following additional packages will be installed:
+  libfile-find-rule-perl libnumber-compare-perl libtext-glob-perl
+The following NEW packages will be installed:
+  libfile-find-rule-perl libnumber-compare-perl libtext-glob-perl usrmerge
+0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
+Need to get 59.5 kB of archives.
+After this operation, 182 kB of additional disk space will be used.
+Get:1 http://cdn-fastly.deb.debian.org/debian buster/main i386 libnumber-compare-perl all 0.03-1 [7642 B]
+Get:2 http://cdn-fastly.deb.debian.org/debian buster/main i386 libtext-glob-perl all 0.10-1 [8362 B]
+Get:3 http://cdn-fastly.deb.debian.org/debian buster/main i386 libfile-find-rule-perl all 0.34-1 [30.6 kB]
+Get:4 http://cdn-fastly.deb.debian.org/debian buster/main i386 usrmerge all 21 [12.8 kB]
+debconf: delaying package configuration, since apt-utils is not installed
+Fetched 59.5 kB in 0s (703 kB/s)
+Selecting previously unselected package libnumber-compare-perl.
+(Reading database ... 
(Reading database ... 5%
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(Reading database ... 100%
(Reading database ... 22865 files and directories currently installed.)
+Preparing to unpack .../libnumber-compare-perl_0.03-1_all.deb ...
+Unpacking libnumber-compare-perl (0.03-1) ...
+Selecting previously unselected package libtext-glob-perl.
+Preparing to unpack .../libtext-glob-perl_0.10-1_all.deb ...
+Unpacking libtext-glob-perl (0.10-1) ...
+Selecting previously unselected package libfile-find-rule-perl.
+Preparing to unpack .../libfile-find-rule-perl_0.34-1_all.deb ...
+Unpacking libfile-find-rule-perl (0.34-1) ...
+Selecting previously unselected package usrmerge.
+Preparing to unpack .../archives/usrmerge_21_all.deb ...
+Unpacking usrmerge (21) ...
+Setting up libtext-glob-perl (0.10-1) ...
+Setting up libnumber-compare-perl (0.03-1) ...
+Setting up libfile-find-rule-perl (0.34-1) ...
+Setting up usrmerge (21) ...
+The system has been successfully converted.
+Processing triggers for man-db (2.8.5-2) ...
+Not building database; man-db/auto-update is not 'true'.
 I: Building the package
-I: Running cd /build/spim-8.0+dfsg/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/spim-8.0+dfsg/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b
 dpkg-buildpackage: info: source package spim
 dpkg-buildpackage: info: source version 8.0+dfsg-6.1
 dpkg-buildpackage: info: source distribution unstable
@@ -706,20 +750,22 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'spim-dbgsym' in '../spim-dbgsym_8.0+dfsg-6.1_i386.deb'.
 dpkg-deb: building package 'spim' in '../spim_8.0+dfsg-6.1_i386.deb'.
+dpkg-deb: building package 'spim-dbgsym' in '../spim-dbgsym_8.0+dfsg-6.1_i386.deb'.
  dpkg-genbuildinfo --build=binary
  dpkg-genchanges --build=binary >../spim_8.0+dfsg-6.1_i386.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/27813/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/27813/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/4000 and its subdirectories
-I: Current time: Fri Jun 14 01:21:58 -12 2019
-I: pbuilder-time-stamp: 1560518518
+I: removing directory /srv/workspace/pbuilder/27813 and its subdirectories
+I: Current time: Fri Jul 17 09:45:23 +14 2020
+I: pbuilder-time-stamp: 1594928723