Does anyone know if Shimano M8000 chainrings will fit on a XTR M9000 crank? The BCD appears the same.....
Cheaper replacement

I don't know with these rings specifically but sometimes the tabs that the chainring bolts go through are different lengths or shapes (despite the BCD/PCD being the same). I've bought a few like this and had to modify them with a Dremel to fit. I've always managed to make them work okay and it's an easy fix but be aware that this can happen mixing and matching chainrings.