There are many differences between "Seven Deadly Sins" and "Band of Brothers." First off being that the subject matter of the two is entirely not related. "Seven Deadly Sins," deals with seven sins that are considered dangerous, while "Band of Brothers," tells the story of one unit who goes through a series of events in World War II. Another difference being that the "Seven Deadly Sins," focuses on one character, where as "Band of Brothers," focuses on a whole platoon.
There is only one distinct comparison that was able to be made about both books. While they have their distinct differnces, both books seem to use real life events to make connections to the writings. Also, both use personal experiences throughout the novels.