One major difference could be in the level of detail and internal thoughts of the characters. The novel might delve deeper into their motivations and emotions. Also, there might be additional subplots or side stories that expand the Star Wars universe in unique ways.
The Rogue One novel story might differ from Star Wars in terms of narrative focus. It could emphasize certain aspects or introduce new elements that enhance the overall story but weren't present in the main Star Wars canon. Maybe there are connections to other parts of the Star Wars universe that aren't obvious in the films.
The Rogue One novel might offer more depth to characters and background details that weren't fully explored in the movies. It could also potentially have alternative plotlines or perspectives.