No of course he can't. Head to head means if they fight each other, and if that happens Vitali would take Joe's head off. Maybe he (and you) mean pound4pound.
I believe you've mixed them up a bit. How can you take away the weight and NOT discuss p4p? :huh You're assuming Joe would beat Vitali TAKING AWAY THE WEIGHT, meaning if Joe was a heavyweight, meaning you're comparing them p4p, cause obviously Joe is NOT a heavyweight. Head-to-head means two fighters facing each other, period. P4P means two guys fighting each other, assuming they were in the same division.