https://store.hmv.com/store/film-tv/blu-ray/crocodile-dundee-vhs-range-(hmv-exclusive)
If you look at the Additional Info, it seems that the second disc is just the DVD version of the movie. Judging by the number of language options available on both it seems unlikely that this is the Australian cut since they would have had to create all of those specific foreign-language tracks for that version of the movie. I’d happily spend the £9.99 to find out if this was the Aus cut if I thought there was any chance but, based on the evidence available, it seems more likely to be just an error with blu-ray.com’s listing.
Curious what you found out about the Original Aussie Version? I’d love to see it A friend had a terrible quality VHS version years ago, and he says it seems to have disappeared.