Is it possible to have 2 different people set up in face id for iphone xs?

Is it possible to have 2 different people set up in face id for iphone xs?

Kind of. The Alternate Appearance setting lets you add another face, in case you sometimes look different enough that Face ID doesn't recognize you. You can have it recognize another person as if you logged in yourself, but the phone will not become multi-user.

Technically yes. There's the initial set up & then there's the optional alternative appearance which some people use as a way to set up for 2 people.