The Prince and the Pauper
Mark Lester, Oliver Reed, Charlton Heston, David Hemmings, Ernest Borgnine, George C. Scott, Harry Andrews, Raquel Welch, Rex Harrison, Sybil Danning, Julian Orchard, Murray Melvin, Lalla Ward, Felicity Dean, Graham Stark, Preston Lockwood, Arthur Hewlett, Tommy Wright, Harry Fowler, Richard Hurndall, Dan Meaden, Tyrone Cassidy, Don Henderson, Sydney Bromley, Ruth Madoc, Dudley Sutton, Roy Evans, William Lawford, Peter O'Farrell, Anthony Sharp, Peter Cellier, Andrew Lodge, Igor De Savitch, Dervis Ward, Michael Ripper, Jacques Le Carpentier
6.2 from IMDB
Tom Canty is a poor English boy who bears a remarkable resemblance to Edward, Prince of Wales and son of King Henry VIII. The two boys meet and decide to play a joke on the court by dressing in each other's clothes, but the plan goes awry when they are separated and each must live the other's life.