Overall, yes, if Mane leaves it won't have much of an impact on the team, but there will be a re-adaptation in the front sector because it puts new players in. Nunez's arrival was for that, to fill the void left by Mane. So Liverpool have signed good players to replace good players. I hope Nunez can quickly adapt to the Liverpool game.
I am sure Nunez will be able to adapt to the Liverpool players because the Liverpool coach knows which position to put Nunez in and the Liverpool coach will also not make a difference to Nunez so Nunez will be easier to adapt to other players and will also feel more compact with another for a team.
I also think that Nunez will quickly adapt to Jurgen Klopp's club. His qualities and abilities are one of the reasons why I am sure that he will be fast in the process. After all, the teamwork that has been created so far at Liverpool will surely make him feel comfortable and show all the abilities he has.