Don’t really know. My only criterion is that the piston shaft has a real dirt seal in front of it. The vented reservoir is also good with self-retracting pads in the caliper. I haven’t looked at the MCP caliper in years, is it a self adjusting style? If so, no problems with using that as far as I can tell. It will certainly be easier to build your brake system with parts from the same place… :-) I just like to do it the hard way I guess!