[Spridgets] Spridget floor pans - what's the difference?

[Lee Fox]

Time to replace the floor pans on a 1974 RWA Midget I picked up.

The Moss catalog shows 455-410 (RH) and 455-415 (LH) for MkII, III and 
IV. They show 455-625 (RH) and 455-635 (LH) for Bugeye and MkI.

I obviously have a MkIII, but a friend has an extra new 455-625 that I 
could buy from him.

What is the difference in the floors from MkI and the rest and can I use 
this for my project?

Thanks.

Lee in St. Louis