So if I were to put my bo2 crank/piston/rod into my blue head xzb would it work fine?

2nd ? Is the pin that goes threw the piston on the bo2/speed dlc coated also?

3rd ? Lol. The 19s crank is smaller then the 21 cranks right? Also what's the head shimming on the 19s? I only have 1 silver shim in mine n i havnt run it yet.