It's pretty much like a spoon and a knife. Both are utensils, but they are not exchangeable for eachothers tasks.
I have used a spoon to cut things and also used a knife to eat soup (to prove a point) - my point is that both methods were inefficient but cool nonetheless.
I would love to see what an XBOX and XBOX 360s could do, maybe even PS3s i've heard of the PS3 being used in High Performance clusters for various things - if i remember correctly the US has banned sending games consoles to certain countries to prevent them having access to cheap high performance computers...