There are both similarities and differences in these two books.
The similarities include a teenage boy protagonist, trying to cope with life, and dealing with big problems. They're both self-centered and rely on themselves. Both Hatchet and The Catcher in the Rye are coming of age stories. They're both set in real places.
There are also some big differences. There's a big difference in the setting. The Catcher in the Rye takes place in New York City.