exrx.com has a large exercise directory, go to power lifts and itll show an animated gif.
oh..and i dont know for sure, but im just thinking a little logically by this. but i think itll have somewhat the same effect..but since your arms wont be shoulder length(considering the diamond bar is wider than most) that will be a difference...and possibly the lower back/abs wont get as much attention. just a hunch though---im no professional.
just keep trying to perfect it. use lower weights like me, i am having a similar problem.