Can I swap logic boards?

So i have a bacbook pro 3,1 2007 model and i want to know with how similar the late 2007 / early 2008 logic boards are .. can i simply just buy a 4,1 a1260 logic board and swap it for my 3,1 ? They look almost identical and i want the 4,1 model as its supported by opclp . Anyone else swapped a board ?