From the (excellent) pictures the silver car looks very nice. That undercarriage with the original factory wax, is almost worth buying the car for alone. Seems one of the front fender was replaced, ideally an original never hit front will show the best hood/fender alignment. In this case it seemed they did a good job fitting the new fender. Brian at MI usually points out when a car has all its original sheet metal intact, in this case he didn't.
The carpet in the red car seems at least partially to have been replaced, but being a late car, velour carpeting was an original factory option, so it could very well be an original replacement. The red one looks pretty OK, but the pictures show too little detail.
So an inspection or a lot of better quality pictures is need to give a good opinion of that one as I see it.