I haven't lived in Australia for six years now, but as I recall the Pilots award was a federal award arbitrated by the Industrial Relations Commission - and as such applied to the entire country.
I thought so too. So before I went to my boss to try and work out a better deal, I thought I'd give industrial relations a ring (think its called fair pay commission or something now). They said that no aviation company is boud by the award unless they are a signatory to it. In other words, they dont have to pay you the GA award unless they have signed up with the AFAP to say that they will pay the award.
If they haven't agreed to pay GA award then you just revert to the standard fedral minimum wage which is pretty easy to find online.
Suffice to say my pay negotiation didn't turn out as well as i'd have liked.
Disclaimer:
I'm no lawyer and I could be very wrong.