What's the difference between Meiyiduo and Meiyijia?

It doesn't matter. Meiyiduo has nothing to do with Meiyijia. They are two different brands.

Meiyijia Convenience Store Co., Ltd. is a chain commercial circulation enterprise controlled by Guangdong Dongguan Sugar and Liquor Group, a local retail giant in Dongguan, and the largest convenience store enterprise in China.

All over Dongguan, Shenzhen, Guangzhou, Zhongshan, Huizhou, Foshan, Jiangmen, Heyuan, Qingyuan, Zhuhai and other cities. Meiyijia was founded in 1997. After eighteen years of innovation and development, it has successively won the honorary titles of "Guangdong Famous Trademark" and "Top Ten Excellent Franchise Brands in China Retail Industry", and has more than 4,600 stores.