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Hi, I'm the author of the SIMM Programmer software (@JDW pointed me to this thread). As an alternative approach to Kay's excellent suggestion above, you can also accomplish this by clicking the "Flash individual chips..." button in the main window. This takes you to a new screen where you can...

Amazingly enough, I actually asked for help with this same question on reddit many moons ago: The helpful information that I received was that the star logo on the top is Hosiden. One person suggested the HSJ0914-01-040 might be the part number, but it doesn't look like a perfect physical...

Interesting, I hadn’t noticed that the stock VRAM was different between the two. You’re right, the CCII has 256 KB and the 550 has 512 KB. They’re listed as the same service part (661-1830) in Apple’s service source stuff, as well as this module identification guide...

The Color Classic II and LC/Performa 550 all used the same logic board and ROM. I'm pretty sure that's exactly the kit you're looking for.