Quite often,, if the OAL from the front of the cylinder boss to the rear of the ratchet is the same as the existing cylinder,, they can drop in & the timing be fine.
If the cylinder is shorter,, you'll get endshake & more "play".
If it's a little long, you can hone the boss down to match the OAL of the existing cylinder.
Next,, as noted,, the "maybe" portion. Timing. It can be just fine,, OR,,, may need a little tweaking. I'd have a gunsmith check it if I wasn't able to do so myself. Me,,, I have the stuff to check my guns.