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If this is about goal contribution, then I would have to say that while Real Madrid have a lot better players than PSG, which means that they will be capable of supporting Mbappe getting better results, it could also be a reason why Mbappe gets the ball less too. I mean there are many great players there, so it means that other players may pass to each other at times and score goals meaning the usage rate of Mbappe may drop, not impossible.At PSG he was the only one that was the super star, which is why I think it is quite clear that we are going to end up with something quite well for him, he got the ball all the time because he was "the" star there. At Real Madrid many players could play differently and could get the ball instead.
I personally think that Mbappe will improve by a lot when he plays for Real Madrid. He may probably not become a goal machine like Ronaldo, but he is going to elevate his gameplay as he will have a much better midfield behind him. I don't know how many world class assists Kroos gave Ronaldo, for instance, but at PSG the midfield wasn't the best he could have to back him up.
At Real Madrid I think Mbappe could become a 50+ goals striker. He was close to it at PSG, but the Real Madrid team will be so overwhelmingly good with him that I believe they will finally get close to 100 goals in a La Liga season. The last time they were close was in 17/18 when they scored 94 goals in 38 games. In 16/17 they scored 106 goals in 38 games.
With Mbappe completing the attacking line, this may again be possible. Vinicius Junior could score 20, Mbappe could score 40, and whoever plays on the left wing (most likely Rodrigo) is probably good for 10-12 goals at least, too. Then you have players like Bellingham who out of a sudden proved to be a striker on top of being a midfielder and a defender!
Real Madrid has good times ahead of them. They will be the team to beat in the Champions League if anyone else strives for the title.