Perhaps in the vast sea of people, among billions of people, there are always a few faces that are met by chance. Although we often say that no two leaves are born the same, there will still be many leaves that look alike, won't there? One in a billion, something strange will happen. For example, people who are not related by blood look alike. So from the perspective of probability theory, it is not surprising that such a thing happened.
Another is to constantly imitate and ponder the behavior and actions of the target, so that you feel very similar to the target. In all kinds of star imitation shows, I make myself look like a star through makeup, and through clothes and actions, people feel that there are many gods. Actually, I don't imitate it after removing makeup. Looks like two completely different people.
In this process of imitation, in addition to the innate difficulty to change, even the characters will unconsciously produce some changes. We often say "husband and wife face" refers to people who live together. Because living together, food and other aspects are very similar, and gradually they are similar. The same is true of such imitators. They always watch the videos of stars, constantly hint at themselves subconsciously, hypnotize themselves and influence their appearance, thus becoming more similar. Except for some natural features that are hard to change, it is really like a person, and it is difficult to distinguish between true and false.