Interestingly, the 538 statistical model portrays Dortmund as slightly better than PSG. Of course, it's imperfect. But I wouldn't completely dismiss it.
PSG have better players than Dortmund and two exceptional forwards in Neymar and Mbappé. Judging by his performances against Bayern, Neymar might be the best player in the world right now. If Dortmund had Neymar next to Haaland, the tie would have been closer.
At the same time, Dortmund have more energy than PSG and ran a lot more over both legs against us than PSG vs Bayern. PSG covered just 100 km in Paris, which is very poor. If they repeat it against us, they will get dominated.
I watched Bayern vs Dortmund back in March (?) and the game was very similar to that between Bayern and PSG in Munich. The main difference was that Bayern had Lewandowski and were more prolific.
So, we have probably a better team than PSG. We need to be at our A game, press them relentlessly (Bayern didn't in Paris) and not being wasteful. We should also stay calm if they score first and keep in mind that there's a 2nd leg. It will be important to score though, so we shouldn't be too calm :)