Nice the MKS is a nice board. I am not 100% sure how close it is to the RAMPS 1.4 but it is based on it.
If you go with the original 1.0.2 Wilson firmware you may have to choose the RAMPS board in the firmware... I think, as there is no MKS boards listed in the boards.h and do a bit of googling running MKS on RAMPS firmware there maybe just a few pins to map maybe.
If you go for the 1.1 version, that is still being sorted... you will at least be able to choose the MKS board from the boards.h and have a working Z axis probe.