Yes, you can swap that over no prob. I forget if I did, but I may have done the same from a IIx. With my 030 upgrade, it really did not matter in the end since I had to pull the chip for the upgrade anyway.

Correct on ROM. But I am pretty sure just the floppy ROM has to be upgraded. Check the other board! I think its a small square one that fits into a bowl socket. If you look at the pics, its the two different sized square chip in those brown sockets. One or both have to be upgraded. I dont have the detail on me.