I have switched many over by just refilling them with R-134. The manufactures claim the oil in compressors is different but I have not had any trouble yet.
I would only change it if the old system is out of freon. The R-12 will cool faster than R-134. The R-134 does not transfer energy quite as well as R-12.
The Older JD cabs, 30 and 40 series, would freeze you out with R-12 but just cool you with R-134.
I do switch them just because of the freon cost but they don't work as well.
I do think the best way is to flush out the lines and install a new re-dryer. Evacuate the system and recharge it with R-134. Almost all of the new compressors in the last fifteen years have oil in them that is okay with either freon.
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