Although they both function to provide air conditioning, there are two almost separate issues here.

First is the climate control itself, second is the refrigeration portion. Regardless of what climate control system, Chrysler servo or otherwise, you still have a refrigeration system to fix. The servo control system has nothing to do with whether or not you convert.

As I said before, it would be much cheaper and give much better a/c to just fix whatever you need to fix in the refrigeration portion and stay with R12.

In the case of the Chrysler servo system, the refrigeration portion is the least of your problems.

Best of luck,