Late 2012 Logic Board Replacement

[s.m.t.]

I need to replace the logic board in the Late 2012 21.5" I have, the graphics glitch out when doing anything extensive with the GPU...

I am wondering what variation of the logic board could be a direct replacement. Faster CPU, better GPU?

Edit:
are the late 2013 boards interchangable?
https://www.ebay.com/itm/Apple-iMAC...138661&hash=item262599f5d0:g:nPgAAOSwkZxdaPZ5

 

[TwoH]

2012 and 2013s are interchangeable - you can fit a 2013 board into a 2012 case and vice versa, near enough everything about them are the same, except specs.