Replying to Salomon MTN labs as a one boot quiver?

So I'm looking into getting new boots next year as I've started touring a lot more this season and full tilts are no longer cutting it. Conveniently enough, 26.5 mtn labs and 26.5 full tilts have an identical bsl. I'm looking at getting a kingpin or ion setup next season with dedicated boots. However, I don't want to sacrifice much downhill performance if possible. I'm mainly asking about using them as an all mtn boot because I know they're compatible with wtr fks, which I run on all of my alpine skis. Say on a day if I went touring slack country in the morning and then in the afternoon wanted to switch to all mtn or park laps, would they still perform/not explode(like pinnacles are known to do) if I landed sketchy off bigger hits? I would still keep my old full tilts for full on park days and urban, but say I forgot to bring both pairs up of boots to the hill one day, would I still be able to get away with only using the mtn labs as a one boot quiver? I guess my main question is durability and performance out of these on the downhill, as coming from full tilts any walk mode on a lightweight boot is going to feel a world better.