Is it possible that the chips are reversed? Try swapping them, it can't really hurt anything.

The Performa 200 and Classic II should have identical ROM. You could swap one chip at a time to narrow down which one is bad.

Also:

is that a picture of this very logic board that you posted? Because it looks like the left ROM chip is installed wrong in the socket. I see an extra set of holes on the top. That doesn't jive with the marking on the logic board. That could have damaged the chip, I'm not sure.