"If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason." -Jack Handey
I know the KS exclusive boxes came with cannons too, but they look to be the same cannons as the Deck Cannons from the core KS?
Correct. It was the same deck gun model for all crews except Bone Devils, who had their own unique version as you mentioned.