Not entirely sure about the feature differences to be honest. As I understand it, early "Sports" didn't have lowered suspension at all, where as the later ones did (something to do with the "Sport" model being dropped but then officially taken back up in 2003). I'm not aware of uprated shocks though, just that the springs were lower (25mm all round). Never heard of the uprated arb. I'm also not sure if there was ever a "factory" sport so to speak (i.e. went on the boat in Japan as a Sport), only that they were a dealer fit (once off the boat). Whilst I know that to be the case for sure with the mk1, not entirely sure of that for the mk2.
Part numbers seem different from 2001 and 2003 for shocks and springs, but that doesn't seem to be related to the "Sport" models, just the 430 in general. No difference in arb part numbers between years.
Mine is lowered on GMax springs anyway.