There are two main "base" types, and one of the types has multiple "finisher" configurations. Look at an A3 1.whatever TSI that has absolutely zero options. See the moulded rubber window and door trim? That's one "base" type. The other is what comes on cars with chrome, black pack, or some other type of "finisher" seated in the base. This distinction really only applies to the trim along the top of the doors, at the roofline. The lower edge trim is a solid piece, more or less, no matter the appearance.
Now... going between chrome and black for the finisher along the upper edges is not incredibly difficult. The pieces are held in by small clips that serve to align and secure the trim. But the bottom edge? Last I researched, I recall that requires more disassembly. So, you're going to have to go into deeper disassembly regardless, so why not source the base all-rubber trim instead? That would mean you'll also have to completely replace the rubber running along the top edge, but the result is trim that you won't have to worry about becoming marred or misaligned. Just look at the B-pillar trim on any Audi to see what marring on their black pack trim looks like. And I've dealt with misalignment- which, while an easy fix, why even bother?
The other perk is that you can probably find someone who wants the chrome setup in place of the base rubber trim, so it should be a cash-neutral affair, if not a moneymaker for you since you'd be contributing the "higher" spec trim.
