I can only speak to the f/t rabbits as I get them sort-of locally from a breeder. A rabbit pinkie is about the size of a large-ish small rat or a small-ish medium rat. A rabbit fuzzy is the equivalent of a large-ish medium rat or small-ish large rat. I can also get half pound rabbits, those are equivalent to XL rats. The jumbo rats (basically retired breeder females) I get locally weigh in at 14-15 oz, so equivalent is a one pound rabbit.

I've also noticed that rabbits can be shorter and thicker than their rat counterparts. So a fuzzy rabbit may leave a bit of a visible lump in the snake's stomach where a large rat wouldn't, even though they're the same weight.

Some people have reported their boas don't like converting from rats to rabbits, I've never had a problem. Most hit it right away, I only had one female who had to investigate her first one for about half a minute before deciding it was edible.

Rabbit prices I pay: 35 cents for pinkies, 75 cents for fuzzies, $1.25 for half pound, $2 for 1 pound, $4 for 2 pound, and then it goes up $1 per pound from there. By sort-of locally I mean I throw two big coolers in the trunk and drive an hour to pick up once every 8 weeks, but it beats paying for shipping.