Sadio Mane has bigger importance for Liverpool than Mo. Salah because he contributed more for the whole tactic operations than Salah. Another plus point for Mane is he is not selfish like Salah. People talked too much about the conflict of interests between Mane and Salah, that I disagree because the main cause came from Salah's selfishness.
Turning back to the point, on-post context, the good news for Mane's fitness condition is very good for Liverpool and sure if he can play at his best, Liverpool has good odds to win that match.
I think that Salah is one of the key players that has led Liverpool to such success.In fact for me is the main player,the one who has contributed more than others in my opinion to Liverpool success without removing anything to all the other players.Of course other players have to give him assists so he can transform them to goals but overall I think he was the most important man for Liverpool during these last years.