Milan vs Dortmund (draw or Dortmund win)
looking at the readiness of these two teams, I think I would say that the chance of a draw is likely to occur, but for the chance of winning, Dortmund will be superior, even though Milan will appear at home with the support of the fans, but from the depth of performance, Dortmund seems to be slightly superior and I say this does not mean I doubt Milan. however, Dortmund also has quite good experience and strategy to maintain its position.
It is not an easy match for both teams and I don't see how AC Milan or Dortmund can easily win the match. They both need to win it get one of two first position in this group. A defeat is nightmare but a draw is a bad result for them too. Likely they will have a draw or if any team win it, it will be only very minimal win for a winner. Both Dortmund and AC Milan don't have too good forms in their domestic league that partially makes this match more balancing and harder to predict its result.
PSG vs Newcastle (PSG win)
I would say that if PSG here will be able to secure its position, this season ambitions look bigger, even though it is still the same as the previous season, but from the depth of performance, PSG is far superior, on the one hand, competing at home has a big enough chance of winning the match and a chance of a draw seems thin.
Look at how Newcastle United won against Chelsea in Premier League last weekend, I think they will be a very big threat for PSG. This match is the same as AC Milan vs Dortmund, both teams will aim at three points but again I think it's hard to predict. PSG can be a favorite team to win this match as they have more experience in Champions League than Newcastle United. However Newcastle United so far, have shown that they are strong enough in this group and they won't easily let PSG beat them.