To run a TII clutch on an N/A you'll need a TII flywheel (with the appropriate series counterweight) and a TII trans, then either a custom drive shaft or the TII->N/A driveshaft from Racing Beat....or Mazdatrix, don't recall which one sells it. Or you'll need the rest of the TII driveline.
Vice versa for N/A clutch on a TII (why you'd do that I don't know
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The differences are the TII clutch has a larger diameter friction plate, as well as the spline count and size of the input shaft (and friction plate respecticvely) are different between the two.