You'd have to actually see him pitch to see which version of Vasquez they're getting.
Neither the 2004 NYY, or the 2006 and 2008 CHW got a lot of 6 ip, 3 ER performances from Vasquez.
By your theory, Chad Gaudin could help win quite a bit of ballgames as well.
Not to mention that's not actually relevant to the discussion we're having, which is a rotation-to-rotation comparison.