The whole hiring process is for the company to answer "Do I want to hire this person?"
If you memorize someone else's interview, either they will recognize you being false (most likely), or they will see you as that someone else, not yourself. Neither is a good outcome.
Don't memorize, but practice
Put yourself in the interviewer's shoes. What would you ask to learn about the applicant? Write down some questions you would ask. Now, switch back to yourself, and write down some answers you would give that explain why you're a good option to pick.
When you attend interviews, go home and write down the questions they asked you, and write out a thoughtful response. Even if the interview failed, it's a good source of material to practice with.
The idea is that you don't memorize word for word what to say, but you do practice answering common questions, so you can get used to explaining your work history, knowledge, ethic, etc.