I believe you are correct. I have found several other A/C parts "discontinued" for a 92' . But the same part number with the last digits A02 became A03, then A04. This seems to be a supercession/ revision number?? The only difference in a few of the parts where the change to 134 fittings.
I can't find anyone who understands the part numbering system, revision and supercession of parts for these cars. Good luck. Bryan.