The blade roast/steaks are the last cuts from the bone in chuck. Usually 1-2 blade roasts come off the bone in chuck, these usually contain the chuck eyes also. The chuck eyes are the beginning of the rib (rib eyes). The meat from the blade and 7-bone are basically the same. Blade roasts being a bit more fatty. Blade roast hast a straight flat shoulder blade bone and the 7-bone has a blade bone that resembles a "7", sometimes very pronounced.
Bnls chuck roast is a split bone in chuck that has been boned out, the whole sub primal is boned out and cut into bnls roasts, steaks and stew.
All very good for pulled beef.