I guess it is perfectly possible that in 1993 the states did attempt to make all the powers of the councils similar.  Anyway, I think a small section mentioning the differences would be better then nothing. The various legislation can be found at http://www.austlii.edu.au/databases.html with this if you wanted, you could come up with a really detail list of differences.  I'm not doing that just now though (if ever).   (Fuck you!)