Is it apple to apple to compare the price of two players? Could be yes, could be no. According to transfermarkt news, the price of Salah is 150 M Euro, while Messi is 140 M euro. This is clear that Salah is more expensive than the best player of the world, Lionel Messi.
Salah and Messi are playing as right wingers of their own club. Salah is from Egypt and Messi is from Barcelona. They are legend players, for sure!
But you know, Messi is getting old, but his price is still that high. He is one of the greatest player ever born on earth. And Salah, would be also a legend and greatest player.