I love my PlayBook/Torch connection as well. And, yes, we're dealing with two different App Worlds. Some of what we find on PlayBook will be duplicated on the marketplace that the Torch draws from. It all depends on what the developer has produced.
For example -- Antair has their Boxee Remote, DelayedSend Premium, Spam Filter Live, and Call Screener available on the Torch's App World. Missing, I notice, is my favorite of their contributions -- Nightstand.
I'm also going to assume that the PlayBook gaming selection is much more rich than what the Torch can see.