The shapes and materials of the two are different.

1. Shape: The shape of Mammoth Dunzi is thicker, while the shape of Donut Pingan is thinner. In terms of specific shapes, the shape of the safety buckle is like a bronze coin, while the shape of the bagel is like a donut in a cake shop.

2. Material: The mammoth pier may be made of mammoth teeth and other materials, while the bagel safety buckle may be made of various gems or metals.