Can be used, but can not achieve the fast charge function.
According to the actual measurement of users and Apple's official support documents, the Apple Watch S7 does not support the use of MagSafe Duo magnetic wireless charging adapter to achieve fast charging. Therefore, some netizens speculate that Apple may specifically launch an upgraded version of the MagSafe Duo charger that supports the Apple Watch fast charge in the future.
This can be charged, because they are consistent with each other, well, Apple watch well, they are a brand.