According to Disney and what is shown in the Resource Center on this site (see sticky at top of any main DVD thread page on this site) Kidani 2BRs are about 1173, BLT about 1152. The difference is in the size of the second bedroom (or studio in the lock-off). BLT's studio/second bedroom are about 340 sq ft while AKV is about 360.
Nevertheless, unlike at Kidani, the 2BRs at BLT actually can vary in at least the sense of size. Those on the outer part of the C-shaped building, particularly in the center part of the building (TP and standard views in that area) because of the shape of the building have seemingly larger than normal living and bedroom rooms (that seem much larger than Kidani) particlualrly as you approach the living room windows and the main and second bedroom windows; while those near the center of the inner C seem smaller because the largest width of the room is near the doorway and the width near the windows is smaller.