Swap CPU Daughtercard between Atari 800 Motherboards?

I have a CTIA Atari 800 that is in great cosmetic condition.  I also have a later 800 that I'm using for parts, and I was wondering whether "upgrading" the CTIA on the original 800 would be as simple as swapping the CPU daughtercards (see photo).  Or can I swap the GTIA for the GTIA directly?

I'm not positive I want to do this because I like having the "original" CTIA 800, but I just wanted to know if I could.  Thanks for any advice.