I have never compared the pans side by side, but one difference would be around the spring pans / mounts. The later cars have a cutout where the front mount of the ½ elliptical springs bolt up. The ¼ elliptical cars donāt have this notch, the spring slides in above the floor pan, and there is a support plate spot welded below the floor pan for some extra support. Other than that I think they are the same. Iāve got some MKI/II pans at the house, I can compare then to my ā73 midget tonight if you need more specifics.