Just for the record…
The differences between Australian and American English are very few indeed, and are primarially issues of spelling.
Australians use the Queen’s English spelling of words like “humour” and honour (“our” replaces “or”) or “Missile” and “Aluminium” where additional letter(s) “i” are added and reflected in a different pronunciation.
Likewise, Australians still accept doubled consonants before suffexes whereas Americans have eliminated them, i.e. “travelling” or “programme” but this is becomming less popular, and many dictionaries now list it as an alternate as opposed to primary choice.
And of course, as with the Queens English, Australians use an “s” as opposed to a “z” in the suffex “ise” i.e. “organise”.
Now you will find that there is a bit of a dual identity, where some Corporations tend to use the American spelling because they labour under the misconception that it is somehow more ‘modern.’ Whereas the truth is, they are most likely reproducing corporate copy from American sources, and can’t be bothered.
The grammar is the same, but. (grin)
Granted, the internet has opened lots of doors for innovative communication, and creative use of grammar, diction, even spelling, however elegance remains elegance, and crap remains crap, even in the colloquial.
And, if you wish to work with language and written communication, then it should become second nature, and you should fall in love with it, otherwise, it’s a long road of pain.
And, I believe there is only one way to spell potato.