So far everyone has been referring to Dodge Chargers.
Look at a 71-71 Plymouth B body 2 door, and a 73-74 Plymouth B body 2 door.
Completely different styling between the two.
The only bolt on exterior body panel that can be moved between 71-72, and 73-74 is the trunk lid, and it even has differences. Every other exterior panel is different.
Virtually nothing ahead of the windshield interchanges between a 71-72 or a 73-74.
Not the exterior sheet metal, not the inner sheet metal, not the frame rail, K frame, or suspension. On a 71-72 The upper control arms mount to the frame rail. On a 73-74, they mount to the K frame. Yes, the 73-74's evolved from the 71-72, but they are not the same car.
My point is the 71-72 B bodies have their own styling, engineering and followers. The 73-74 B bodies have their own unique styling and engineering, and their own followers.
I think it would be beneficial to the fans of all these cars to have sections devoted to the two groups. That's all.