Smaller fan that pushes less air.
Smaller heatsink that matches AMD's weight specifications.
Improved lapping.
No, they are not the same, but they are made for the same processor line. I'm also curious to see how they perform in comparison to each other. I'd imagine that the Volcano 11s perform better. They have the smae heatsink style, but the Volcano 11 is larger. Also, the Volcano 11 pushes more than 50 CFM more than the Volcano 10 (both airflow measurements from the manufacturer).
Pain is the realization of your own weakness.