I used one 2 oz. can of oil, which also added 1 oz. of R-134A (3 oz. total in the can).

Compatible? Should be, PAG oil is PAG oil. I don't know what "type R" means where Nissan is concerned with regards to PAG oil, probably means "refrigerant" or may refer to the weight.
Odds are that I really didn't lose enough oil to warrant adding more, but I figured better safe than sorry. Might have more like 8 oz. total in the system now for all I know.
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