FT is what you know it to be 'Frozen Thawed.' PK is just 'Pre-killed' regardless of how the animal is killed. You can do it however you'd like.
Some just thump and feed prey still 'twitching' to the snakes, not quite killing them; I did something similar, but in such a way that the rat/mouse would die within a few seconds (hopefully) and I'd feed off a portion to snakes and the rest would be bagged and frozen for times of need, or you can CO2 them. I liked the latter for the reasons I mentioned, and because their death is cleaner. I used to have blood spattered randomly at times manually killing the rats and it made me feel, well, pretty messed up!
I did also have a slightly taller narrow tub for euthanizing single rabbits too. I CO2 my bunnies as well, because believe it or not, a rabbit can be pretty effective at injuring a snake when fighting for it's life! I have scars from kicks received from rabbits, not all of them that bad either, but they don't seem to heal well for me.
I'm sure there are others more experienced here that can chime in if I've missed anything or there are differing opinions. I did try something before I got my canister once, after a lot of internet research... I think it was to mix baking soda and vinegar, to get fumes that would do the same basic thing. I didn't do well with that one, huge mess and not a lot of fumes LOL! I think CO2 is easiest personally.
Good luck!
Steph S.

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