Im so sick by flyleaf, is there a different version?

Oh, yeah, there are two versions. One has more guitar in it, it seems like, and it sounds slightly different. That happened to me too, I like both versions, but when I went to put it on my iPod, I got some different one that I wasn't used to hearing. I'm not sure what they're called, though, or even if it's indicated in the title the differences. That'd be something to google...