Using the 1980 280ZX as my example, there was a USA Calif. model, USA non - Calif. model, and a Canada model. There was 10 different models of this mix using the R-180 and 9 models using the R-200. What diff. came with these cars depended on where it was to be sold, what trans it had in it, if it was a 2+2 or GL model and if it had T-TOPS.
LARRY