Originally Posted by mark_k
My guess is both systems would be mostly compatible at the software level. The older one has some clues about ancient history though; cartridge slot at the front and guides/connector for the cartridge. The cut-out in the casing for the floppy drive is 5.25" size; since the Amiga was originally going to have a 5.25" drive.
If the metal box is the Lorraine prototype then, I guess, the software compatibility is limited. As far I know the Amiga chip set was luma-chroma based. It was converted to RGB after Commodore acquired Amiga.