It will be close +/- a tiny bit, I would be very happy with that as a Jets fan.
First off, I'll be a bit surprised if Trouba is traded right now. Secondly, I have no idea what his value would be, but I'm not sure you can count on that it would be similar to the Hall/Larsson trade. Value isn't determined in a vacuum, so you would need to find a team that feels Trouba is critical piece for them and have a surplus of something you want. I'm not saying he won't return something like that, but you can't count on it either. Add to it the contract terms that were mentioned above and it adds even more variables.
Edmonton desperately needed a player like Larsson and with McDavid, RNH, Draisatl, Eberle, Hall, Lucic, Puljujarvi...as well as Yakupov, Maroon, and Pouliot, they could afford to give up a talented winger in Hall to make their team better.
I know it's contrary to popular HF belief, but IMO, that was a very good trade for Edm. They've still got a deep stable of forwards, some of them elite. They've got a decent goalie, and now, "If healthy", they have the makings of a very good defense with Larsson, who is just coming into his own, Klefbom, Sekera, Davidson and Nurse. I wouldn't be surprised if EDM is comfortably in the playoffs next year or at least in the hunt right up to the very end.