NO, unfortunately Samsung Galaxy Watch Wear OS mostly does not work on the China smartphones. There are exceptions like the Oneplus series or Xiaomi devices with Xiaomi.eu, but on most other smartphones from Oppo, Vivo, Meizu & Co. the watch will not connect to the smartphone. Even on a China Samsung smartphone, it won't work. 

Normal Wear OS watches from other brands have no problem. They only need the Wear OS China app from APKMIRROR.com and then it should work.