After all, in this season the fact is that PSV also has very good results in the Eredivisie, because PSV managed to win all its matches in the first half of the season. Indeed, the results of matches in the domestic league cannot be fully used as a benchmark for their performance in the Champion League. But yes, at least with the good results PSV has in the domestic league is likely to make PSV's morale also remain good in the round of 16 against Dortmund later.
PSV have a stable morale with doing excellent results in the Eredivisie and progressing to the round of 16. This aspect of them is better than Dortmund's, but the Champions League is a different competition with its own dynamics. No body had thought that Dortmund would do good at a tough group stage. I think Dortmund will show their best in Champions League to compesate their performance in Bundesliga.
Regardless of Dortmund's performance in qualifying for the round of 16 in a difficult group, Dortmund doesn't seem very reliable, especially considering the results of their last 6 matches in all competitions. Dortmund has never won in its last 6 matches, including the Bundesliga, Champions League group stage matches and also the DFB Cup. Therefore, I am not sure that Dortmund will go higher in the Champions League this season even if PSV is also not very hopeful.
In the Champions League, PSV and Dortmund both have the opportunity to qualify for the quarter-finals. PSV plays at home first and then visits Dortmund, but Dortmund is a team that may have a higher probability than PSV. I'm not sure about one of them, but Dortmund have good experience in the Champions League.