It can't be that similar, can it?

The tip of Bupleurum chinense DC. mostly has short fibrous leaf base, while the tip of Bupleurum chinense DC. is densely covered with fibrous leaf base.

the head surface of Saposhnikovia divaricata root is rough, often with peeling cork and obvious dense links, and there are dark brown hairy residual leaf bases on the nodes, which is its obvious feature "broom head", which is obviously different from the leaf bases of Bupleurum chinense DC.