If its the orginal paint from the Ford factory you have to take into account the sun bleaching the colour no matter how well looked after it was. The shell I picked up was resprayed about 18 months ago apparantly, but when I put my boot lid, bonnet and front doors on the paint was too dark.

Sometimes you can get the paint to blend in so you don't notice it, but I did find that my Tasmin Blue saph was a pain trying to get the colour to blend even when we had the closest match possible.