You can change it. However, you need to take the relevant exams. If you want to change your C license, you need to take the Subject 1 exam; if you want to change your B license or above, you need to take the Subject 1 and Subject 3 exams.

According to the "motor vehicle driver's license application and use regulations"

Article 29 of the foreign motor vehicle driver's license to apply for a motor vehicle driver's license, should be examined in the subject. Apply for a permitted driving type for large buses, tractor-trailers, medium-sized buses, large trucks motor vehicle driver's license, should also be examined subject three. Belonging to foreign embassies and consulates in China, and international organizations in China to apply for personnel, should be implemented in accordance with the principle of diplomatic reciprocity.