Nobita and the Legend of the Sun King

Doraemon: Nobita and the Legend of the Sun King, also known as Doraemon and the Empire of the Sun, is a 2011 Japanese animated science fantasy adventure film, which premiered on March 11, 2000, in Japan, based on the 20th volume of the same name of the Doraemon Long Stories series. It's story is an alteration of the story The Prince and the Pauper by Mark Twain and Snow White by the Brothers Grimm as the two main characters switch places.