Chosen Solution
Basically I’ve bought a 2012 logic board on ebay for a bargain and its a way higher spec than the macbook pro i previously fixed. Anyway according to ifixit guides and wikipedia basically besides the logic boards, the 2011 and 2012 a1286 models are no different components wise. So therefore can I buy a 2011 macbook pro thats broken and put it in? Reason being is on ebay they are significantly cheaper.
If you have a board from a retina machine it must go back into a retina machine - it can not go into a non retina machine. Likewise a retina machine can not be driven by a nonretina board. If this Answer is helpful please remember to return and mark it Accepted.
