dude was gonna mention you may have a prob but didnt wanna piss on your fire, my mate had new doors on his DG mk 3 and they were all different, got them a bit better with T cut etc... at least yours is only 1 door not all of them
green is the up their with the worst colours for fading etc, but his were so far out i we think they had been repainted at some point
try the polish etc on the rest of the car see what you can do, how noticable is it in the flesh, bearing in mind not everyone will know you have changed the door so may not be noticable to others if that makes sense?