Are all GU transfer cases the same from 4.2's through to the last of the 3.0's? With the same ratios & mounting patterns? What might one in good condition (low mileage or rebuilt) be worth?

I will need to decide to keep the NP205 case.or switch to a Patrol one on the OKA. Not yet sure of the pros/cons of going either way, just that both types are used.