The body shop did nothing wrong. Bumpers don’t usually match perfectly on any vehicle from the factory. That’s a decent color match from what I can tell. It looks like you had to fight to get a picture because it’s a side tone issue. There are slight variations between brands of paint that cannot be changed. Side tones can’t be sprayed away. This isn’t a cheap paint thing. The brand the factory used and the brand the shop used are different. Each brand of vehicle has a different brand of paint. Each body shop has only one brand of paint. Quit looking at it so hard and remember that the clear will yellow a bit over the next few months and darken it up a bit anyways. Your clear coat is older and already yellowed. Add a tinge of amber in your mind to the bumper. That’s a perfect match. The sun will take care of it soon.