Does anyone know anything about 3.0 tdi's?

I have a 2007 Audi Q7 that has spun a shell and destroyed the crank and rod.

The engine fitted is a BUG engine code, i am having trouble finding a 2nd hand lump!

Does anyone know if an engine from a different 3.0 tdi model with different code will be the same (A6, A8, Q7 ect)??

Or what differences they do have if i found a different code engine?

But if it comes to it i may have to rebuild it if i can find a crank!