But Lone Wolf also offers 357SIG barrels in non-standard (stainless, traditionally rifled, extended, ported) configurations that will fit your gun, if that's what you want; they'll be labeled as G31 barrels.
Before you make this move, you might want to call around and compare your SIG 357 ammo vs your .40 S&W. I have already made the move with a SIG 357 barrel for my G23 and have found quite a spike in the ammo.
I have a G33 as well and have gone back to .40 S&W with this Glock. Although in my case, it was more for uniformity and not having to hunt down two calipers to practice with.