Sentence examples for the same person from inspiring English sources

"the same person" is a correct and commonly used phrase in written English.
It can be used anytime you want to refer to a person previously mentioned or known in the sentence. For example: - Sarah and John are cousins, but they look like the same person. - Can you confirm that this is the same person you saw at the party last night? - The witness claimed to have seen the same person leaving the scene of the crime. - I can't believe that's the same person I knew in high school. - It's amazing how two people can look so different and yet be the same person.