Even though Arsenal's match was quite good last week, it will not necessarily be easy against Sevilla later. Even though Sevilla in the local or last match did not show their best players, of course Sevilla will not remain silent in the next match. Playing with full support from the audience will definitely be an encouragement for the team, or as additional ammunition (stamina), yes of course Sevilla will have a surprising impact in the match because Sevilla will reduce the point score in the standings.
Sevilla did something quite good in Laliga because they managed to hold Real Madrid to a draw in last Saturday's match, well no one thought they would be able to do it because they saw how the two teams were in quite different conditions.
With these results and also how Arsenal could only get a draw against Chelsea in the English Premier League, this will make the third match in the Champions League interesting and difficult to predict because Sevilla could beat Arsenal even though they are not favorites to win even though this is a home game for Sevilla. I'm pretty sure Sevilla will be able to surprise them by getting points in this match because they really need this because defeat will only further close their chances of qualifying for the knockout phase.
maybe I dont equate performance in the domestic league with performance in the UCL because in the domestic league they usually dont perform optimally when they have a schedule that is close to the UCL match. I mean, yesterday match had a break that was very close to the UCL match schedule and it is possible that the two teams you mentioned did not perform optimally in the previous match in the domestic league because they had saved their energy to appear strong in the UCL so it could be that the UCL match will be stronger.
but even so, I would still rate these two teams as having almost the same performance because even though they have never won in the UCL, Sevilla has proven to have a very strong strength in defense, while Arsenal has a very perfect attack line but has a slightly weak defense. so both teams have almost the same advantages and disadvantages and the possibility of a draw is very big and to bet on this match choosing both teams to score would be better for me.