It's not as if we can perfectly predict this for you...snakes, & especially BPs, can be pretty opinionated, & mice and rats just smell vastly different, so while one snake might switch easier from f/t mice to f/t rats, another might switch easier from live rats to f/t rats.
Personally, if I was seriously interested in the one taking live rats, I'd ask the seller to offer him a f/t rat & see if he takes it. That way you can rule out the stress of re-homing that may influence ALL snakes to refuse ANY prey offered...and of course, you have to hope the seller is honest about the snake's reaction too, but it's worth a shot.
Another thing to consider: many snakes will switch easier from live to fresh-killed, and THEN later you can switch from fresh kill to f/t.
BTW, I'd advise against keeping ANY snake on live prey, mice OR rats, but especially rats! As they grow up, they are formidable opponents that fight back effectively & sooner or later your snake is likely to be injured enough to need a vet, or worse yet, be the victim.
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