You mean that parts are interchangeable between different franchises? Yes.
But the parts themselves are not manufactured by VW. They do come in WV packing with labels, however are manufactured by OEM companies. For example textar/brembo manufactures brake pads/discs, hella for headlamps and rear lamps, pierburg/bosch for fuel pumps, continental for pneumatic pumps, lemforder for control arms, bushes etc etc etc.