A dealership bodyshop is just that, a bodyshop. There are good ones and bad ones. Their paint is no better/ no worse than any other bodyshop just because it's at a dealer. It's probably likely that a dealership would use a name brand top to bottom paint system. Some smaller shops us generic clears which can have less durability than the name brand stuff in an effort to save material costs. Ask them what system they use and what clear they use. If they are using name brand clear and basecoat: Dupont, PPG, Glasruit, Sherwin Williams... You should be good.
Also that Dupont paint camera has never given me an exact match. It does always give me a blendable match. A missmatch may be obvious in his case since the car is getting piece painted. A lot will depend on the color.
BTW what color is the car?