Would it be a good idea to use different variations of a language in a novel?

Though the difference may be subtle most of the time, would it be a good idea to use Australian English for a set of characters and British English for another set a characters to create a more unique dialogue? I assume it would be recommended if you were writing British and Australian characters. Would it still... show more Though the difference may be subtle most of the time, would it be a good idea to use Australian English for a set of characters and British English for another set a characters to create a more unique dialogue? I assume it would be recommended if you were writing British and Australian characters.

Would it still apply if it were fantasy so the reader can identify the fictional cultures the characters belong to by they way they speak?
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