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.
"I suppose that is the evolution of it. When you look at the International Olympic Committee, they're very keen for all sports to have regional qualification, which also limit and helps the cost-side of campaigning in each sport so I think that's definitely something that the IOC would like and it's certainly something that the Pacific [Games] Council is thinking about as well. I'd like to think one day that this will be a great tool for people to qualify and use to make the Olympic Games or make certain events as qualifications".