From the factory, the bumper covers are painted off the cars, at different times. today's paints must be done at the same time or blended into adjacent panels to match. Quality control of paint on new cars is bad these days. If you have three cars with the same paint code and exchanged panels on the cars, they would not match!! So every job we do is new territory even if we are familiar with the color. Insurance companies will not blend into adjacent panels to make a bumper cover math either, I've tried to get them to do it. They simply reply with a laugh and say"they don't match from the factory"