I thought that Down-Under English was very much close to the "Imperial" one in spelling.
Then goes Canadian, while American English differs the most.

Oops, I forgot Indian and Pakistani ones:)
Wait, they're close or even the same in spelling as British, but pronunciation kinda differs*:)*

Seriously, I beg your pardon for my inquest. I'm interested in the matter.
Actually, I kinda know that the Australian pronunciation is close, but in fact, I can't be sure about the spelling now that I remember not digging much in it.🙂