First part code likely superseded the later part and that's about it.
Suitable resistor is likely to be found in late 80's and 90's VAG B series cars and golfs and B3/B4 passats, as B3 audi heater is derived from mk2 golf heater and thereafter they changed a little until at least late nineties - for example interior fan is the same in B3, B4 and early B5, of both brands.
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