Ok, I have to go with Trist on this one...kinda'.
I hear similarities, yes. But frankly, I don't hear the exact same song. I just don't.
For the record, I like both songs. I don't think they are the greatest rock songs ever made or anything. For that matter, if they are one in the same, I don't think IT is the greatest rock song ever made. But I like them for what they are. I think they're both fun to sing along to in my car, despite the fact that anyone else who can hear me would think I was being choked to death.
Anyway, I hear the similarities. I hear the not surprising similarities of 2 songs written by the same people. I think there are loads of other bands out there that you could do the same thing with 2 of their songs. So this does not dissuade my view at all. I like Nickleback. They are not 'teh awesome." But they're still cool, IMO.