1970 Dart 340 Emblems

I think you'll find that the crisper one is a repop - I have a set somewhere that look like the other "dirty" ones that I believe came off of a '71 340 Duster
I'm hoping somebody can help me out. I got my first cold air hood for my 1970 Dart from a 71 Demon donor, so I went to the dealer in 1980 and bought a set of 340 emblems for the scoops. In the pictures they are the old set of emblems with no nuts. I recently bought a pair of similar emblems, which are the new ones in the pictures with nuts. They are significantly different. the face is flat, the detail is crisper, even the bridge between the 4 and the 0 is thicker on the old ones. The new ones have crisp chrysler part numbers on the back. Can anybody tell me which are original or why two different versions?