Yeah, as near as I can tell, that's the only thing they changed.
My problem with the AU release is more philosophical than practical. The refusal is stupid because there are numerous other games already on the market here that have similar drug use. It's inconsistent. Plus, in some matters I seem to have a purist streak that meanders well into obsessive compulsive territory. Apparently Fallout is one of those matters.
When something this stupid happens to my beloved computer games I want to hurt the Australian games industry in the hope that at some point it will become such a serious issue for them that they will start to lobby a bit more emphatically for a change to the system. The only real way that I can hurt the industry is to bypass aussie retailers and buy the goods from somewhere else (I'm too pretty - and gutless - to go to gaol so anything more anarchistic is out of the question).
So, in short, they changed the name of the drug "morphine". And I'm not really very happy about it.