Diff of the two buildlogs:

--
--- b1/build.log	2020-04-30 14:10:18.485318581 +0000
+++ b2/build.log	2020-04-30 14:18:32.655744757 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Jun  2 08:32:59 -12 2021
-I: pbuilder-time-stamp: 1622665979
+I: Current time: Fri May  1 04:10:20 +14 2020
+I: pbuilder-time-stamp: 1588255820
 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 Tue Dec 11 04:43:17 2018 -12
+gpgv: Signature made Wed Dec 12 06:43:17 2018 +14
 gpgv:                using RSA key 5D0187B940A245BAD7B0F56A003A1A2DAA41085F
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./node-html5shiv_3.7.3+dfsg-2.dsc
@@ -29,6 +29,18 @@
 dpkg-source: info: applying 0001-Remove-not-need-grunt-depends.patch
 I: Not using root during the build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/9049/tmp/hooks/D01_modify_environment starting
+debug: Running on profitbricks-build12-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/9049/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -288,7 +300,7 @@
 Get: 212 http://deb.debian.org/debian buster/main i386 node-uglify all 2.8.29-6 [118 kB]
 Get: 213 http://deb.debian.org/debian buster/main i386 node-uri-path all 1.0.0-1 [3220 B]
 Get: 214 http://deb.debian.org/debian buster/main i386 node-grunt-contrib-uglify all 2.0.0+dfsg-1 [15.0 kB]
-Fetched 28.9 MB in 1s (38.5 MB/s)
+Fetched 28.9 MB in 6s (4596 kB/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.)
@@ -1163,7 +1175,7 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/node-html5shiv-3.7.3+dfsg/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/node-html5shiv-3.7.3+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 node-html5shiv
 dpkg-buildpackage: info: source version 3.7.3+dfsg-2
 dpkg-buildpackage: info: source distribution unstable
@@ -1221,12 +1233,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/9049/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/9049/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/47342 and its subdirectories
-I: Current time: Wed Jun  2 08:33:17 -12 2021
-I: pbuilder-time-stamp: 1622665997
+I: removing directory /srv/workspace/pbuilder/9049 and its subdirectories
+I: Current time: Fri May  1 04:18:32 +14 2020
+I: pbuilder-time-stamp: 1588256312