They're different. They share the same last, mold, and buckles, but there are some difference other then just flexability. Bootfit will matter on alot of things that cant be answered without looking at your foot width, heel width, arch height, instep height, ankle pronunciation, current footbed, calf height and shape, whether or not you pronate or supinate, toe length, foot canting, what kind of skier you are and want to be, and the list goes on. I'd go see a bootfitter on a day that they're not busy. Ask questions, and have him/her measure you up. If you get the idea that you know more or as much as he/she does, then go find another bootfitter. You can email the kind folks at Masterfit University and they will recomend one in your area as well.
Lots of kids rip without much of this kind of service. But the best stay there because a proper fit truly ups your game. Bootfitting is my passion, I quit a good paying career to live poor and happy. I'm not a great skier, and never will be, so this was my entrance to the ski industry and I fell in love with it.