The Magnificent Seven is a 1960 American western film directed by John Sturges and starring Yul Brynner, Eli Wallach, Steve McQueen, and Horst Buchholz. The picture is an Old West-style remake of Akira Kurosawa's 1954 Japanese-language film Seven Samurai. Brynner, McQueen, Buchholz, Charles Bronson, Robert Vaughn, James Coburn, and Brad Dexter portray the title characters, a group of seven gunfighters hired to protect a small agricultural village in Mexico from a group of marauding bandits and their leader (Wallach).

The Great Escape is a 1963 American World War II epic film based on an escape by British Commonwealth prisoners of war from a German POW camp during World War II, starring Steve McQueen, James Garner, Richard Attenborough. James Donald, Charles Bronson, Donald Pleasence and James Coburn. filmed in Panavision.

Therefore, Steve McQueen, James Coburn and Charles Bronson starred in the two block busters.

More Info: en.wikipedia.org