How many Australian Accents are there? What about New Zealand Accents? Are there differences between the New Zealand & Australian English?

In Australia it's international English. Plus foreign languages. Australian accents are now rare in Australia.

Australian accents range from sounding almost English to complete bogan. 

you will find older people have stronger Australian accents, younger people are losing it. because of the American influence on everything they see and hear.

different states use different words for some objects such as one state says suit case, another will call it a port.

Maori is a language of it's own, but New Zealanders have their own accent with words pronounced slightly different than Australians.

first, there is an aboriginal accent an accent for Queensland Victoria SA WA NSW NT and Tazmania

so there are 7 different accents

if we dont include the asian accents

but the Adelaide hills have a slight german accent