I-5 crankshaft differences?

[Ameer Antar]

Anyone know what the difference is between all the different crankshafts for
Audi 5-cyl. engines? The KH motor has a different part # than the MC, and
the later MC even has a different number....althout the replacement part #'s
are the same for the KH and early  MC...according to the family album. Any
idea in what the difference is? Can they be swapped? How about for non-turbo
I-5's? Is it weaker or anything bad about using a non-turbo crank in a
turbo? Any ideas much appreciated.

-ameer