Yeah, when they list compressors as R12 or R134a, it's basically what oil they put in it for storage/shipping, the seals are compatible with both.
But if you're going to PAG and it had R12/ester before/originally, you have to flush, AND make sure you change all the other seals in the system to PAG compatible seals. Coat with proper oil when installing.
New seals/PAG compatible seals are usually green in color, old R12 ones are usually black. Kind of an easy way to tell.
Since you're going pretty much all new you should be good. Older A6 compressors I believe have older seals possibly internally, not sure, but you will find out the hard way is you use an older compressor.
For conversions it's usually best to use the PAG46 since is closer to the viscosity of ester.
OE service manuals started having conversion info a few years before going strictly to 134, and not sure how far back they went with conversion info.
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