I haven't looked into it in any detail, but a cursory examination suggests that those two little SOIC chips on the underside of the upgrade are Flash/EEPROM chips with content which would need to be copied.
There's also a modified version of one of the Apple logic (PLD) chips on the upgrade, IIRC.
Right now I'm trying to duplicate a 68000-16 brainstorm upgrade my brother has, ROMS are the problem.