Chosen Solution
Is it possible to replace the logic board in a 2010 macbook pro 13 inch with a logic board from a 2009 macbook pro 13? I have a water damaged logic board on my 2010 macbook pro and found a good deal on logic boards from the 2009 macbook pro 13 inch versions.
Generally you really need to stay within the same generation when swapping parts around. Often downwardly compatibility is more workable than upper. In this case your issue is more complex Apple often reconfigures its logic boards between generation families. I doubt these would be interchangeable. If you know the exact models review the iFixIt guides to see the differences between them.
Thanks for trying with success the “downgrade”, I am looking for an older board as the a1278 2010 board is really really expensive 150€! People are totally foolish…