Board Thread:News and Announcements/@comment-5047768-20131003005753/@comment-100066-20131003104830

Any time you see a version of a hero in a different medium, such as a comic book, a TV show, a movie, etc. they are probably in a different universe.

So, the Captain America in the comic books is different from the one in the Avengers movie and they have different Earth designations. Check out the Captain America disambiguation page to see how many different kinds there are.