Is Yongsheng Petrochemical's oil the same as that of Sinopec?

It's different.

Yongsheng Petrochemical Co., Ltd. is a modern large and medium-sized energy enterprise focusing on petrochemical energy products, integrating petrochemical storage, refined oil sales, chemical products sales, coal sales, gas station operation management and supply chain integration. Sinopec, the full name of Sinopec Group. It is a state-owned company wholly owned by the state, an institution authorized by the state to invest and a state holding company.

Yongsheng Petrochemical has oil depots in Lishadao Petrochemical Base in Dongguan, Puyang in Henan, Zhuhai, Qinzhou Port and Rizhao in Shandong. Yongsheng Petrochemical has built an influential sales network of petrochemical energy products in South China and Central China by virtue of its advantages in refining, warehousing, logistics, trade and gas station management, and firmly occupied the gasoline and diesel markets in Central China, South China and Southwest China.