Nope, it's the same but it does mean you have a slightly more complicated, not difficult, system. More things needed to be balanced rather than just put a box on the wall and pipe to it or remote pump both hot and cold therefore balancing isn't an issue, which was the understanding. He's suggesting just pumping hot and using a PRV to balance the cold which could work but more things that could go wrong over time IMO. A good universal pump won't be cheap either.