Alternatively, iFixit lists two different Apple P/N between the late 2013/mid 2014 and early 2015 rMBP models. I'd guess there is SOMETHING different, but I can't tell you what or if it actually presents a compatibility issue.
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- Yes. Something is different. But lots of components that are different are still cross-compatible between machines. Only way to find out is to try i, I guess.