What is the difference between implied patent license and exhaustion principle?

There is no implied license of patent in Chinese law, only this theory is occasionally applied in practice.

Which law have you read? There are only express and implied in civil law.

Even in theory, they are not the same thing.

Patent implied license is to protect trust interests;

The exhaustion of patent right means that the patented products (including products directly obtained according to the patented method) manufactured by the patentee himself or licensed by others are legally put on the market. After that, anyone can sell or use the product.