As has been alluded to, for the most part pilot and FA trips are built very differently due to differing work rules and FAA rest requirements so having identical trips for most airlines would require bidding very specific and likely senior trips.
As far as being able to hold some of the same layovers it's a bit more possible as long as the more senior of the two is the one who has a bidding timeline that comes later so they can attempt to bid to match the other's schedule. At that point seniority can be wildly different.
If you're senior enough it might be even easy to have the same trips, the catch is how senior that is. On the junior side it'd probably be more important just to try to bid for the same days off while you could.