THC is generally 750 RMB /GP or HQ, which is collected by the shipping company and the dock fee is collected by the dock. Huangpu is generally 300-400, which is collected by the consignment car, and Shenzhen 150, which is generally collected by the customs broker. It seems that it has nothing to do with exporting countries. The shipping companies that accept THC have calculated that some shipping companies charge ORC, also called dock operation fee, which is 269 dollars.
So they won't charge twice.