Are you serious?
One is the hendo-hop from a few fight out, one is the hendo-hop closer range. They're the same exact punch.
Not only is it the same first punch, the second dropping punch is identical. Henderson probably just wasn't used to someone having a chin so weak that they're splayed out like a baby after the first one.
Wow you really are an idiot if you think the punch wouldn't have Ko'd shields if it landed on his chin....oh wait it's you.
The bisping one had a lot more velocity behind it where as the shields one was from in close and glanced off of the back of his head.