As mentioned above, there is no ambiguity about it. Even if Pence grabbed the mic like Kanye and announced he was voting against conviction, everyone would ignore him and walk away. 67 - 33 is a conviction. Period. 67 - 33i (imaginary 34th vote) is still a conviction.
As for whether he would vote that way, there’s no way, no how. Elections are a crapshoot (as 2016 proved). Pick absolutely any politician in federal office. Tell them they can be President this afternoon by pushing a Staples Easy Button™. Every damn one pushes the button.
