The two large bombs in the lower photo are 22,000 lb Grand Slams. The single recessed bomb is a 44,000 lb T-12, sometimes called a Grand Slam too but mostly just a T-12.
The T-12 was a 44,000 lb deep penetration bomb, it started as a directly scaled up copy of the 22,000 lb Grand Slam. But because the overall length of it wouldn't fit in the modified B-29 or a standard B-36 bomb bay, the tail cone was shortened. My top photo shows it with the shortened tail cone.
The Tallboy was a 12,000 lb deep penetration bomb that was the first to emerge during WW.II, followed by the Grand Slam some months later. My dad was in 617 Sqn. when they used these bombs and he told me one time the scarest part of these were when they brought the bomb back with them because they couldn't see the target, they weren't allowed to waste the bomb by just dumping it on the return flight.