I think this is a really interesting question, because I've always thought they had similar skill sets, and the 6 game run Tebow and the Broncos went on I found to be eerily similar to the one the Titans and VY went on during his rookie year. (Lots of close games and fourth quarter comebacks, winning some games with less than stellar numbers from the QB, etc) Hell, New England even ended both streaks. I was intrigued and even compared their numbers in those 6 game winning streaks, it's ridiculous how similar they were. (The short of it: Young threw for more yards, but in many more attempts so that their YPA were pretty close, they ran for almost the same yardage, but Tebow had many more attempts so Young had an edge in YPC, both turned it over 3 times, and Young had a 10 to 9 edge in combined passing and rushing TDs)
To me, the question is going to be whether Tebow can develop as a passer in a way that VY never did. If he doesn't, I don't think he'll have a long enough leash in Denver to get to VY's win totals, even though Elway has changed his public message. VY was a top 3 pick and had ownership backing even after his coach grew to hate him.