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Is it correct that all NA6, NA8/NB8A rear calipers are the same. Only the rotor diameter and caliper bracket vary? Obviously Left and right are different.
I just saw this http://www.mx5parts.co.uk/rear-caliper-genuine-mazda-mk1225-standard-brake-p-302.html. So now I am wondering if I already have spares in my garage.

So I thought I'd answer my own question.

Based on all the bits I have, it looks like the Calipers ONLY are interchangeable. The Caliper brackets, pads and spring clips are different.

So if you do a NA6 to NA8 upgrade, it's worth hanging on the calipers, as spares.