Tough question to answer and many will want to see pics. It certainly could be an error, though having two of each number would be less common. Realize that a different vin and fender tag vs. the body numbers is the classic rebody. Depending on the factory process it could make sense and I think mistakes happened more frequently than people realize. If the car is somewhat original, do the fender tag options seem to match the car? That would go a long way toward making me feel good about it. If the car is in boxes with the dash out and little to document how it was, it would be tough for a potential buyer to be confident- same as if the car was restored, that would scare me quite a bit and my car has a factory VIN typo. Some people will feel ok as it is only one number out of place but many won't.