Who is the twin of a king or prince of an Arab country who uses a very similar person

Who is the twin of a king or prince of an Arab country who uses a very similar person?

Very special reports talk about the presence of a man who very much resembles a king or prince in an Arab country. This person sometimes travels to places instead of the king or prince, and appears in pictures and videos published from time to time.
But he does not speak, but only appears in public. Reports say that this man, who joined the army in this Arab country, and his story is considered a state secret.