BP's are generally a calmer snake and of course get much bigger/fatter than a corn snake. The biggest difference you will face is feeding response. BP's can really be a pain to get on a consistent feeding schedule, some are worse than others. BP's aren't as tolerant of temperature swings/cold as corns are so make sure that your cage has a hot side of 90 and a cool side of 80. Don't let the cage get below 75 or above 95.
Don't expect your BP to be out and about all the time, a hiding BP is a happy BP. Mine generally sleep all day and roam around their cages between midnight and 2-3 A.M.
Overall BP's are great "beginners" snakes like corns are they are mild tempered and are hardy compared to some other snake species.