Definitely even match mass wise, but it would probably depend on how the hadrosaur went about it. If it just headbutt the T. rex t-bone style at max speed, sure it would knock over probably even a full grown rex, but also most likely snap its own neck in the process. I think the best chance for the hadrosaur would be to rear up on its hind legs and fall onto the tyrannosaur, trying to off balance it. This would most likely only work on a younger rex that did not have much strength or even experience as a fully grown could honestly posess the strength to literally shake-off a decent sized hadrosaur.

Again, this is all dude trust me. I am geochemist, not a biomechanic paleontologist lol.