Upgrading from Debian to PureOS


I couldn’t install PureOS from the installation media because of some incompatibility with my librebooted X200 Thinkpad. So I installed Debian Buster and switched the sources.list over to the pureos repository. Everything went fine, but I just noticed that it didn’t replace firefox-esr with purebrowser. So I uninstalled firefox and installed purebrowser. Are there any more problematic applications for which PureOS has a replacement? Also, is there any easy way for me to change all the artwork? I changed the grub splash screen to a PureOS splash screen. Are there any more?