Australia does not give a dam what you are doing anywhere else in the world,
spend a few years overseas and you are faced with doing another "Initial instrument rating" ride but, the good news, or bad news, is you don't have to to the written exam again.
Practically, the person doing the test wants to see you pass what is required and nothing more. An initial issue is where they want to see a bit of stress and fatigue that occurs after an hour or so...
When I return to Aus, I'll do that "initial" again at a place where it can all be done in minimum time.