What is the difference between Shanghai GM and SAIC GM?

SAIC-GM is the group headquarters of Shanghai GM, which is a subsidiary of SAIC-GM. The two are subordinate. Shanghai General Motors Co., Ltd. is a joint venture between Shanghai Automobile and American General Motors Company. SAIC General Motors Co., Ltd. was formally established on 1997, and its business scope includes manufacturing automobile engines, gearboxes and parts. General Motors is the headquarters of SAIC-GM, which is a subsidiary of SAIC-GM in China. Gm's global production and sales models include Buick, Chevrolet, Cadillac and other brand products, including electric vehicles, heavy trucks, full-size trucks, compact cars and other models. The series of models launched by GM sell well in more than 20 countries and regions around the world. Million car purchase subsidy