Interestingly, Disclosure (on iView) from Warners, I had a quick check the other week but it didn’t appear to be edited. Also an R18+ title, previously aired and cut on both Nine and Seven.
Perhaps the difference is, the former last had a re-rating in modern times (2009) and it up-held the R, whereas the latter was last classified for early DVD way back in 1998.
Despite the current system largely dating back to early 1993, SBS and ABC (who do have different Codes to CFTA) sometimes do disagree with the original film OFLC / ACB decisions and either opt for unedited R or even a lower classification, especially if from the 90s or certainly prior to 1993. But Seven, Nine and Ten have never usually done that and I’d say are too nervous to.