It is naive to assume that Real will play defensively in this pair and will give PSG a lot of chances to score. Real Madrid have one of the strongest middle lines and PSG will not be able to dominate in order for their strikers to feel at ease. Even if Neymar fully recovers to this confrontation, I think that Real will at least have no worse chances than PSG.
In the game, I believe Mbappe's he will try to do everything he can do to make Real Madrid buy him. Real already has an amazing coach and they play as a team on the other hand, although PSG have a good team, they most times are playing individual not as a team. I’d suggest that the coach improve on his tactics for them to be able to beat Real.
Are you implying that Mbappe will score goals into his own net? In order to please the management of Real Madrid even more
In fact, I do not think that in this match there will be at least some background to this transition (which can already be considered as 99% completed). All football players will try to show their best game and maybe Mbappe will be able to score, but whether this is will be enough for overall success is unknown (my prediction: not enough).
Actually I look at this issue from a totally different angle. If I was Mbappe I wouldn't want Real Madrid to win the Champions League the year before I sign a contract with them. In fact I would want them to lose early and then when I join the team win the trophy, so everybody says that Mbappe made the difference. I never thought a player who was about to transfer to another club would harm the club he is currently playing for.