So I want to replace the seats in my car (2014 Estate) - upgrades. I'm thinking of a Passat CC half leather or maybe S Line seats.

What I'm wondering (naively) is, rather than VW making a load of different spec'd wiring looms, do they just put one wiring loom in all models so as to reduce production costs? Bascially, if I buy electric seats, do I already have connections in my car to power and operate them?
This would also apply to steering wheels, I want to put a scirocco SW in - are they bolt off, bolt on with the same functionality?

Info appreciated.