If you can find out the versions of these changes you may have a good idea.
"Changes and updates from Commodore version:
Updated C/Version (Y2K patch)
Addition of Libs/workbench.library (for A-4000T 3.1 ROMs and 3.X ROMs)
Updated S/Startup-Sequence (for 3.X ROMs)
Updated Installer 44.10 and FastFileSystem 45.9 (to support larger disks)
Installer itself is now part of the system installation (inside the Utilities directory)"
Edit: No changes listed for KS ROM
