I think they're the same thing. One possible aspect of holographic principle (remember, not a theory, but a conjecture, a mental exercise) is the basis for the new age "Holographic Universe" idea, yet another "theory of everything" that doesn't usually go over too well in science.
I read part (about a third) of The Holographic Universe on recommendation of a friend who was convinced that it was a good idea. He was quite annoyed at my "close-mindedness" when I told him I thought it was basically New Age pseudoscientific BS. I remember the author (Michael Talbot) making bizarre claims about how humans can use mind control on computers and how he witnessed objects spontaneously floating in midair. Really ridiculous stuff (though there's no significant push to teach this garbage in public school science classes...)