I believe that there are now two other 'approved' jigs in NZ but none in Australia.
Your questions about the Aussie AP4 cars are valid.
Scuttlebutt is that, after signing up to the concept in agreement with MNZ, CAMS has experienced some dissention from a couple of prominent players and, with their championship about as pathetic as the APRC, they've buckled to the pressure.
I would be surprised if any of the cars not built in NZ, (including the two Aussie cars recently publicised, the two Mitsubishis and the Japanese Vitz), actually comply with the specifications.