The similarity here is noticeable. Pixar needs Brave to be a hit and, to be fair, they marketed the fact that the lead character uses a bow and arrow last year when the original trailer came out. Still, there is no escaping the fact that The Hunger Games is the biggest thing on the planet right now. That is, until we see how The Dark Knight Rises and the Avengers perform.
It is worth noting that I believe we will see more of this "heroine with a bow and arrow" thing crop up.