Well logically I would speculate that both of those US cars had rear sheet metal damage at some point and the original USA panel was changed out for the EURO panel.
I have seen absolute artists with sheet metal that are as good as plastic surgeons on faces where you will not only never see their work but not even suspect that any had been done.
I will also point out that, to the best of my knowledge, there were no USA black cars ever produced by the factory so that right there fits into a story that the black car is not original to a USA build.
Also Kevin Marti only has Ford's records of cars SOLD in the US. He does not have Detomaso's Euro records.
I was also ADVISED that in some cases with other cars Marti is fabricating "window 'stickers" with information from other sources then Ford. That I can't confirm, who can, but it is something to keep in mind when Marti's reports conflict with information from other reliable sources.
The purpose there being that they look original and the more they look original, the more that people will believe they are accurate?