Kind of.
1st of all, both games weren't that different in the 1st half. What changed was arsenal scored on the chances they had while city didn't. We could have been 3-0 down at half time with city as well, but not only didn't they score more, they let Gyökeres loose twice, which he capitalized once.
Again, like against city, we started the 2nd half strong. We scored once, had a few more chances, but didn't score again. And again, like in the city game, they got a penalty. Haaland missed, Saka didn't. That 4th goal killed any potential comeback.
Lastly, I don't want to crap on our players, but Pedro "Pote" Gonçalves was a very important piece of our win against city. Yesterday we played with Marcus Edwards, who's very inconsistent and had a real stinker.
All this to say that yes, Amorim leaving at this time was a blow, and yes, the new manager is still getting his bearings on the massive job he has ahead, but both games were very similar, we just didn't have fortune on our side yesterday like we did 3 weeks ago.
Lastly, it's interesting seeing those interactions in training. They did that A LOT here, with players getting "punished" by running the gauntlet when they break the rules.