Answer:
There are enormous differences. The Maoris are a Polynesian people with complex family and tribal structures and warlike traditions. They adapted to NZ landscape, which is mild and fertile and they were quite numerous when Europeans arrived. They put up fierce resistance to Europeans in the Maori Wars. They are still numerous in number and they have signed a treaty with the NZ Government. They tend to be very strongly built with traditional tattoos, often in their faces.
The Australian Aborigines have been in Australia for tens of thousand of years, nobody knows exactly how long but it is in excess of 50,000 years. They have the oldest continuous culture in the world - by far. Because of Australia's relative barrenness they were spread thinly across Australia but had hundreds of languages and peoples. Some were hunter gatherers in the deserts and others fished and hunted near the coasts. Because of their relative scarcity they were no match for Europeans though in many cases they resisted very fiercely but were quickly killed or imprisoned. In Tasmania they were systematically hunted until only one woman was left alive. They tend to be slimly built but have a passion for sport and many of them are very famous Australian footballers. Their speed and agility are legendary.
Both Maoris and Australian Aborigines are very proud of their heritage.