It's getting into semantics. In the modern battlefield, if you get your enemy to fire a gun that you know has a jammed barrel (as in 1994's "Surviving the Game"), or walk into a field that is laid with mines, both plans would lead to the death of the opponent due to your actions. In this case, Harry knows (or at least believes) that if Voldemort tries to use the killing curse against him, the wand will prevent it; does he know it will backfire to the extent that the spell's caster will be killed, maybe not. Heck, he even warns Voldemort against it, so sure he is about what's likely to happen. So really, it's Voldemort's arrogance and closed-mindedness which kills him, rather than magic, per se. Coming back to the point, does that mean when they are face to face, mano-a-mano, that Harry beats Voldemort, since he's the one who lives? I'd have said so, since he induces Voldemort to commit to the actions (even after fairly clear warnings against it) that result in his own downfall.
[Ironically, Voldermort only has to change wand, since Harry is no longer using his own holly/phoenix one, and he'd be able to kill his teenage nemesis... ]