Real Madrid and PSG both will have a clear mind before this matchup if they go on like this in their domestic leagues. And it seems like this will really happen. Because both of them are at a very great position in their leagues right now. And they have big chances to become the champions there. But they don't aim only those titles of course. They both are aiming the CL title. We will see which one of them wants it more.
I am guessing that there is a good chance they could do whatever they want in the league, like put up youngsters in order to give the stars some break. However, it is not really about the equality of the rosters, I feel like PSG has much much better roster right now, but it is about chemistry and that's a lot better situation for Madrid, because they have a good amount of chemistry which PSG doesn't have.
So, we are seeing a team with bad chemistry but better roster going against a team with great chemistry but worse roster. I can't say which one will win, but I can see PSG having a great game and having an unexpected big win as well. Like for example if they could end up with a 3-0 result on that game, I will not be shocked, because it is something that is possible and definitely something that could happen very soon in the near future.