It's funny that you should mention the similarity between the piano sounds.
While I agree that the identical sound is probably less than ideal in most situations, the music that was covered in this submission lends itself strongly to having two pianos that sound alike in it for various reasons. It's just my opinion, of course, and yet I find it easy to share it because though there is so little distinction between the tones it feels, to me at least, to convey a subtly stronger idea than if they were differentiated.
What strikes me about the piece is how they seem to attack each other, and yet they also complement each others' sound to the point where any distinction between the two is tossed out in favor of an overall synergy (buzzword, take a shot!) emphasizing the scheme presented by both the original work and this rendition, namely, that this is a kick-ass boss fightin' tune and you'd better have your beatin' shirt on.