Unauthorized R134A conversion

[Hangtownsvx]

A remanufactured compressor was put on my 92 last week and unbeknownst to me converted to R134A at the same time. If asked, I would have said to keep R12. I am sure the conversion was proper, but it doesn't seem quite as cold. I see that the condensors had different part numbers between R12 and R134A. Does anyone know what the difference was? physical size/performance or just fittings?
The original compressor just blew up suddendly. I understand there is a lock washer for the swash plate that gets old and desintigrates. I am prepared to return to R12 for Sacramento heat.