I've read that some dash pad replacements had a smooth spot on them, some did not, and that most replacement pads really fit poorly. The pad on my '69 is curled above the glovebox like many others, and I bought a replacement from someone selling an original GM dash removed to make a pro-touring car. I got the dash, and it certainly does look old, but it also looks very different than the dash on my car, which I assume is probably original to the car.
My dash is fairly grainy with the material used, and the "stitching" around the top edge and perimeter of the dash shows excellent detail. The dash I got is not quite as grainy on the material, and doesn' show the extreme detail of the one in the car. It still shows the stitching, but not as clearly.
There are no part numbers, markings or anything on the replacement I got, and I haven't removed the dash in the car to see if it indeed has any GM stickers or anything on it.