Haye would do far better against Vitali.
Vitali is far slower. Haye almost closed the gap on Wlad several times and grazed him several times. He would connect easily against the much slower Vitali. Additionally, Vitali doesn't hit as hard so Haye has more incentive to attack, and won't be as visibly terrified as he was against Wlad. The same fight isn't possible.
So if Haye moves around he will have a lot more freedom and more chances to connect. Vitali has a solid chin, but no chin is unbreakable (this is where walshb tells me Toney's is unbreakable
), especially at the age of 41. I personally think Haye would UD him. Vitali doesn't have the legs and power to chase Haye and control him.