I think Madrid will aim to wrap up the league title sooner to pay more attention to the UCL.So they will try to beat Barca today no matter what, because if they win today their Laliga Title is secure. On the other hand, Barca will try to keep their season alive by defeating Real Madrid so it will be a different battle in a different mindset.
Real Madrid will not allow its closest rivals to win at home to Real Madrid today, because it is not just about the title this season. But it is also about the prestige of a team like Real Madrid, which would be quite embarrassed if they were defeated by their closest rivals at home in today's match. So it will be quite possible for Real Madrid to play as well as possible today in order to win at home and this will also make it easier for Real Madrid to win the La Liga trophy this season.