Happy to help!
Literature and AmericanLiterature are not the same course. They look a lot alike because both are broken down by genre, so the lesson names are the same. The readings, which are by far the most important aspect of the course, are much different. While you'll still be studying the same genres - short story, poetry, nonfiction, the novel, and drama - you'll be studying exclusively American authors whose works were not included in your Literature course.
Please let me know if you have any other questions!