IDK about other Aussie cartoons, but it was a pretty common practice with British preschool shows airing in the US for a while.
The original US airing of Peppa Pig back in like 2005 had American voice actors replacing the original British ones, both versions of Bob the Builder did it (although apparently recent US repeats use the original British version), and, probably most notably due to how long the show aired, Thomas & Friends did it as well. (Hilariously the new reboot of the latter has the British English version being the redub)