I can't see any mismatch in the picture - looks really nice to me. I have a Snow White Pearl car as well, and am very happy with the paint on mine.
The same paint applied on metal and plastic (e.g. bumper covers) can appear slightly different to the eye, with varying direction and strength of the light source. Pearl is especially finicky that way, and is very sensitive to how that coat is sprayed on.
Next time you are walking through a parking lot on a sunny day, take a close look at the front bumper covers on white cars where they meet up with the metal fenders. You'll see a lot of subtle variation there, that you wouldn't notice unless you were specifically looking for it.
Especially with pearl paint, change the angle you are looking at it, and you may find the section on that other car that you thought was ever so slightly 'brighter' now looks slightly darker. Once you realize you're not alone, forget about it and enjoy your car ...
