Not really. Deer hearts ain't all that big. Head is a smaller target than what is often called the "kill zone", but that "zone" also encompasses the lungs which are most likely to be hit. Hit 'em in the lungs and they will die.....after they jump and run for a bit spreading the adrenalin. With a head shot you shut them off like a switch. High neck shots accomplish the same thing in my experience.
A neck shot drops a deer.