It's great when snakes will eat whatever's offered. Unfortunately, most BPs aren't that open-minded.

@ Nutriaitch: I meant to mention that one way to switch a snake over is once they're big enough to take 2 smaller items that roughly equal the size meal they've been eating, you first offer what they prefer as an appetizer...& that should be the smaller item, literally just an appetizer. Once a snake downs something they like, they're often more forgiving about the second item, & also try imparting some of the scent from the preferred food to the new one before offering. Most snakes are pretty pumped up about eating, so if you can sneak in the new prey for a second item (without feeding too big a meal), they often learn to like the new thing offered after the next meal or so.

That works for switching to f/t from live or fresh-killed (f/k) as well, not just different kinds of prey. There are some snakes that are very stubborn & won't accept it, but be patient, & most will.

Also, with f/t prey, you can use feeding tongs to slightly "pinch-damage" the rodents nose to release a little more scent- often that helps a snake recognize their prey, as when going from live to f/t.
Frozen rodents lose some of their aroma.