Yes, they can be. Both often have engaging storylines and vivid characters.
It depends. Some aspects are similar, like the types of themes and character development. However, the format and the way the story is presented can differ significantly. Manga is visual, while light novels are mainly text-based with occasional illustrations.
In some ways, they are. They both offer imaginative worlds and can cover various genres. But light novels might focus more on detailed prose while manga relies on visual art to tell the story.