1. The Norwegian crab belongs to the family Fanxieidae of Decapoda, the Norwegian crab is a giant crab, and the king crab belongs to the family Lithocaridae of Decapoda, which refers to the stone crab in kamchatka peninsula. Their families and species are different.

2. Norwegian king crab is a kind of super-large crab, with thick legs and a body length of more than 1.5 meters, while the king crab is smaller than the Norwegian king crab, only one third as big as the Norwegian king crab.