Where can I find mbp logic board compatibility information?

I have an mbp late 2015 model and I want to do a DIY upgrade to the maximum compatible logic board, but I can't seem to google up any reliable information, and it turns out that as bizarre as it is, the board's port etc can be compatible from 2013 to 2014, but completely different in 2015, then completely different again in 2016? Which complicate things even more. Where can I look up a chart or a list or in my case specifically, a late 2015 A1502? So my question is where can I find information regarding the compatibility and you can answer by either giving me such information, a link, or tell me what is the maximum compatible logic board model for my machine, which is A1502 late 2015. Thanks in advance!