Chelsea beat Forest in the PL to qualify for the Champions League. Now things could be more interesting.

I mean I'm not sure if they will play as good as that match here.
Chelsea's motivation after confirming they will compete in the Champions League next season after beating Nottingham is increasing to face Real Betis, but Chelsea's target is not as easy as thought because Real Betis will be different from Nottingham. Chelsea will be overwhelmed against Real Betis.
If Chelsea were weak, I could say that too, but Chelsea are showing a good level of play now, so Real Betis will not be something shocking for them, they are ready for it, it's just not an easy opponent, but on the contrary - a worthy one, against whom they can impose a good game. But I think it's impossible to say who will be stronger, neither now nor later before the match, both teams are good