Share Xbox Game Pass between two consoles simultaneously
Solution 1:
Yes!
The Xbox Live infrastructure hasn't changed. You will be able to set the Series X as Home Console via the Settings -> General -> Personalization menu where you can set "My Home Xbox".
This feature is a feature of the Xbox family and works identically across all Xboxes. Keep in mind that this means that you can have one Home Xbox, not one of each kind (i.e. Xbox One and Xbox Series X).