Endorsements and ratings are another matter, but hours are hours no matter what country you fly them in, so long as you follow Australian rules for logging them. (E.g you can't get away with logging dual or "shared time" as PIC like the yanks can in some cases).
Best to get someone official-sounding to put a "flight times correct to date" stamp/signature in your logbook before you come home though, just in case anyone accuses you of making the hours up.