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a brand new drier can be used for R12 or R134 .. it's fresh and clean inside so can go either way .. but once it's charged, you can't change it again because it will be contaminated ..
Evaporator, condensor, and everything else can be used for either so long as they are properly flushed out and evacuated to remove all contamination.
You also have an orifice tube in one of the lines in the system .. it has a little screen on it that traps dirt .. always should be replaced, if not replaced along with a filter-drier will void almost all new compressor warranties
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