Diff of the two buildlogs:

--
--- b1/build.log	2020-05-06 01:14:06.141033819 +0000
+++ b2/build.log	2020-05-06 01:20:26.173615209 +0000
@@ -1,6 +1,7 @@
+W: cgroups are not available on the host, not using them.
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jun  7 19:36:51 -12 2021
-I: pbuilder-time-stamp: 1623137811
+I: Current time: Wed May  6 15:14:07 +14 2020
+I: pbuilder-time-stamp: 1588727647
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +19,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Fri Mar 13 03:52:03 2015 -12
+gpgv: Signature made Sat Mar 14 05:52:03 2015 +14
 gpgv:                using RSA key 054CB8F31343CF44
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./checkpw_1.02-1.1.dsc
@@ -30,6 +31,18 @@
  checkpw-1.02/checkpw.c
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/14060/tmp/hooks/D01_modify_environment starting
+debug: Running on profitbricks-build2-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/14060/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -71,7 +84,7 @@
 fakeroot is already the newest version (1.23-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/checkpw-1.02/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/checkpw-1.02/ && 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 checkpw
 dpkg-buildpackage: info: source version 1.02-1.1
 dpkg-buildpackage: info: source distribution unstable
@@ -655,12 +668,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/14060/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/14060/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/3476 and its subdirectories
-I: Current time: Mon Jun  7 19:37:03 -12 2021
-I: pbuilder-time-stamp: 1623137823
+I: removing directory /srv/workspace/pbuilder/14060 and its subdirectories
+I: Current time: Wed May  6 15:20:25 +14 2020
+I: pbuilder-time-stamp: 1588728025