So I removed rear caliper to measure. And oh damn they are small https://photos.app.goo.gl/sFlqFwgeZr51704K3
Still don't get it. There are two types, one for older vehicles, one for newer. And difference is less than 1mm in both directions.
So it doesn't make any sense
Iirc, one of the LEAF changes along the way had to do with the brakes; something to reduce the pressure of the pads as they rest against the rotor when not in use, to eek out some efficiency. 2013 model year I think. The calipers were changed so perhaps the pads had to change somewhat also to accomodate that.