The main difference is the flare of the sides, with the lowest plank bent vertically to form a pointed stern so the water can flow smoothly away without the turbulence that follows Snarly wherever she goes. Above is a neat V transom giving a very attractive shape to the boat.
The first Mahurangi punts were built of solid kauri so they must have weighed a ton, especially as lengths ranged from 16 to 18ft (Snarley is a mere 11ft). This is a modern copy in plywood built by Colin Brown of Whangateau Traditional Boats.
I really like it. It looks as though it would have all the advantages of shoal draft with none of the vulnerability of the Hampshire punt's vertical sides and low freeboard. Does anybody do any plans?
There's more on their history here.