67-76 Wheel base differences?

Plymouths were 108 and Dodges were 111 in 1967. The 1971 Valiant Scamp HT went to 111 (basically, a rebadged Dart Swinger). Valiant 4dr went to 111 in 1974.

I always thought the difference in length was in the rear seat floor area (more leg room). Hardly worth doing just to make the trunk deeper.