Leica r80mm Summilux

Optically, what relationship between the 75 and the 80?

The 75 and the 80 are identical, except that due to the smaller form on the M the focal length was changed from 80-75 so it matches the 75 frame lines then. It was not possible to make it a 90 and still retain the f1.4.

The 80 is a bit better, but optically they are the same. You will see this when you compare images from the two. However the 80 is a bit better overal. Size wasn't a problem.
 
Did they just change the distance between the front and rear modules? Is there a measurable difference in the physical length of the two lenses?

I've changed focal length on a few lenses before, changing spacing between front and rear groups. The change in space between the optics versus the (small) change in focal length surprised me.
 
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