binaural and spatial is the same, 3d is quite different and really nothing compared to real spatial sound. check the link I left in my other comment, I explain

binaural and spatial is the same, 3d is quite different and really nothing compared to real spatial sound. check the link I left in my other comment, I explain the differences there. but wikipedia will probably do a good job too. after you understand that, you'll see why i'm asking the question, sound tech is really behind