Not quite the same thing. "Finding users posts" displays the actual post itself, not the thread. There is another option, (Find Members Topics) but that only shows the topics that person started not just the ones they have participated in.Click on your profile, or anyone's. There is an option to search for user's posts and user's topics
How about ye olde "egosearch" where it shows all of the threads you've posted to?
I think Maibock and I are looking for the same thing.