revhead's got it a bit backwards, *A2#'s are all the same aft of the firewall except for trim differences and fuel tank position. from 22 to 23 the engine bay got longer and wider. (easiest way to tell is that 22 and previous had sloped front indicators, 23 had straight up and down)
* = T or R for engine
# = 0, 1, 2, or 3 for body style
24 onwards was fastback's and 23 and previous were notchbacks. 24's and 27's had the same skinny short front end except they had straight up and down indicators (and awesome bonnet trim). 28's (and 30's and 35's????) had the same front end as the 23's.
22's, 23's and 28's are the most common in NZ (not that 28's are VERY common), i know of a RA21 (LHD import from canada) and mike's TA27 of the rarer one's, there might be a couple more floating around but i doubt it.
and back to the original question, i'll just text a mate to see if he knows and i'll get back to you once he replies, i've only got the TA23 ones handy and since you've already got them i guess that won't help
cheers
Matt