It's a demo version. Sounds exactly like the one I have except for 1 thing. On mine Bono screams something out at one point mid way through and this one he doesn't, but otherwise it's exactly the same.
I have a bootleg disc of this that has about 13 alternate takes of Two Hearts Beat As One and that is where this is sourced from. All are either instrumentals or just slightly different from what you hear on this Youtube clip.