No, they are not the same at all. Rooms at OKW are bigger and because of building layouts, will probably be quieter (BCV rooms are laid out with long hallways where OKW is separate buildings). Balconies are bigger at OKW. Theming is different. OKW is more S Florida palm trees while BCV is New England ocean. OKW is spread out, far from parks, quiet, relaxing--feels more like a destination resort with beautiful grounds, small ponds w/fountains , ducks swimming, etc. BCV is walking distance to Epcot and has a lot of hustle bustle activity, especially since it shares the Stormalong Bay pool are with the Beach Club and Yacht Club hotels (and it is the best pool on property).
Each place is very nice but you will definitely have a different type of vacation depending on which location you choose. If you want to feel like you are in Disney 24-7, you'll enjoy the BCV. If you want that down time to relax and recharge, you'll enjoy OKW.