They are the same brand.
Yihetang and Yihe roasted milk are the same brand. Yihe roasted milk is the milk tea launched by Yihetang brand, and they are not separate brand names.
Yihetang is affiliated to Wuhan Yihui Drink Technology Co., Ltd. Yihetang has more than 5,600 stores in 200 cities across the country and has entered many shopping malls.