I will work fine.
FWIW, I have 20s and 12s, and prefer my 20s (but thats just me) but I also have the low comb, recoil pad buttstocks on the swap barrel set-ups; a Monty Carlo on a shotgun I dont think would work for me, though it might for you. Point is, that if you like the MC on the '06 and swap to shotgun, but have to swap buttstocks, you might as well buy an inexpensive 20 or 12 complete and be done with it. Both long guns will fit nicely in a two gun hardcase and your are ready at a whim.