zeb ,i`m not so sure aussies fit this criteria OP in as much as we aussies tend to be more lazy in our speech.
I dont think 2-3 hundred years by whites in australia would/have produced very much difference in dialect
I have only lived in Victoria and Queensland both for many years and the differences are minimal .their is certainly no problem understanding anybody from any of the states that exist in Australia.
I think the example you give demonstrates that , as does , owyagoin ,gday
.Certain states have different words for the same thing such as port in Qld ,school bag in Vict. meridian strip in Qld. and nature strip in Vict. but again I dont think that is what the OP meant