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Looks like the original R12 system retrofitted to R134a. nothing is really different from the original, other than the added fitting to accept R134 charging tools, and hopefully the correct oil was added to the system when it was done.
I think the 1993 factory R134a system had a slightly higher capacity - to help counter the slightly less effective cooling of R134a vs. R12.
Not really enough of a difference to worry about, I think. It's more important that the system is properly charged and has the correct amount of oil and a clean filter/drier and a properly operating orifice.