We have a tendency to view humanoids like @Tesla_Optimus like individuals. But if you own four they will all be identical, always. If one learns something they all have learned it, same goes for work force robots or governmental robots like police. 

If you have a conversation with one of them, you have communicated with all of them. They will be one identity, ai, conciousness with many bodies.

One physical unit will be exactly like the other.