I would agree with the "test it" recommendation, but I doubt you'll see much difference unless some part of it was resprayed with the dings on, or if it was clearcoated at the factory with the dings on. This has happened to a few people.
I would also venture that you can't just pull off a small section. You may have to take off one entire strip, clean all the adhesive, then give it a good polish to get a fair comparison. Still, if you do this on, say, the right rear door, it won't tell you if someone resprayed on the left rear door.
I guess the worst case is you find something after you think you are all done, and then want to put all the strips back on.
I don't know of anyone who has had a problem with paint fade, though.
