When considering which car to buy I checked out some Ford Focus forums. Differences in colour between the bumpers and rest of the car was a rather hot topic for the new model, with countless pictures of poorly matched cars. In fact, when I went to a couple of Ford dealers, I was amazed at how bad many of them were.
I think most manufacturers struggle with this issue, with Honda being no exception. There's a slight difference with my Alabaster Silver (much of it down to light angles when viewing), although I think it's a pretty good match.
I think you have to compare your own car with several other Civics in the same shade and then decide if the match is acceptable. Certainly if the first thing family/friends say when viewing your car is "but the bumpers and rest of car don't match!", then you might have a problem
