| MedManZ states, oil and perhaps port seals are different. I do not know about the shaft seal. The main and most significant diffrence in r134a systems is the condenser. r134a gets hotter on comression, to compensate for this the heat exchanger design has double the passes. 1994 and later condenser shown on the right. There are different O-ring seals throughout and the TSV is replaced by the TCA to help the expansion valve control evap temp. 
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