The trademark categories are different and the companies they belong to are different.
1. Different trademark categories: Good Shield belongs to Category 35 - Advertising Sales, while Yisi Shield belongs to Category 5 - Pharmaceutical Products.
2. The companies they belong to are different: Jiahuidian belongs to Foshan Shunde Shunshi Brand Management Co., Ltd., while Yisi Dun belongs to Shandong Yisi Dun Biopharmaceutical Co., Ltd.