For Roma I think they can do it but for Napoli they won't be able to do it until the end of the season. Napoli still have to improve their overall performance and even though they have just won against Juventus, this cannot be a strong guarantee for them to continue to progress with consistent wins.
Napoli need to win a lot to catch up on the existing points, the victory against Juventus cannot yet be a benchmark, even though judging from the statistics of the matches that have taken place, Juventus is more favored but this kind of thing is not uncommon to find in football, at least Napoli needs to win in a row without any goals in their net to catch up on the existing points.
Yes Napoli must continue to get wins to get back to competing in the top 3, to not concede goals I think it will be very difficult but to get the victory it is much more likely to be achieved, the victory against Juventus is one good step to continue to collect points and the next match against Torino which is quite strong also in the opponent and has competitiveness in the top 10 standings, just like the comparison of Napoli and Juventus, Torino has a chance of victory too if it is underestimated.
What I want to highlight is the match between Inter Milan vs Bologna which is experiencing very good development, the last five matches Bologna has collected wins and is now moving in 4th place in the standings and trying to approach Milan which is only 4 points difference with Bologna.