Along with New Zealand, Australia accepted an invitation to enter teams in taekwondo, weightlifting, sailing and rugby sevens in this year's event in Port Moresby.
A proposal to include the Trans-Tasman rivals in all 28 sports was voted down by members of the Pacific Games Council two years ago.
The 2015 Games in PNG are viewed as the first step towards a full regional championship, akin to the Asian and European Games.
Australia Chef de Mission Malcolm Page can see the logic.