Whether or not there is such a place in the brain or somewhere else that stores a person's identity?? If such information could be copy and pasted, different individuals might be able to experience the same identity and when they interacted with reality the experience should be shared (one example of what should happen, but this is a long topic to consider). Suppose it would not be possible to clone identity because it violated some law of physics sort of speak -same object occupying different spaces at the same time- or because it violated the nature of reality for example colors should not exist, in other words, the dynamics or the mechanism of the nature of reality cannot not be changed, (long topic) but it was possible to transfer the fingerprint of someone to something else, then what?
a lot of guesses... but we cannot put ourselves into someone else's shoes and experience it unless it happened to us personally and then we might be able to know what it feels like and believe that the illusion of the senses that we experience as reality is our identity experiencing it in something else. OR maybe it is something else beleiving. But even if we did believed it was , would it really be us or something else believing it was us?