You can't claim ownership of 2 different consciousnesses. I don't even know that it's theoretically possible. You are either yourself or you are that someone else. This is the case because even if you clone yourself perfectly and up-bring the clone EXACTLY as you were, ignoring the uncontrollable variables that would make them slightly different, to the point where they were exactly like you, you would not have perception of their consciousness on a personal level.
So especially in the case of a completely different person, to try and know what they process in their brain, their thoughts, ideology, motives, believes, etc, no, you won't truly know what it's like to be them. To a degree by studying their genetics, neurology, and upbringing. But fully, no.