The last post in this thread claims that high side pressures were too high with the larger compressor. I'm not sure that was due to a larger displacement compressor since variable displacement will maintain a constant high side pressure since that is the design intent.

Engine swap, new engine has larger compressor, charge weight more/less? [Archive] - Refrigeration-Engineer.com forums

This thread shows that someone made the 15 - 17 swap but didn't follow through with an update.

http://www.peachparts.com/shopforum/tech-help/337571-w124-larger-c-compressor-same-harness.html