No, Gone With The Wind isn't one of those type of movie. But a B-movie might use some shots from the Burning of Atlanta sequence for a burning city anywhere in the world. Partly because of the studio system, there were a lot of shots taken from big expensive epics and used as background events for less expensive movies. Quite a few from the 1939 version of The Four Feathers show up in British movies of the Fifties, partly because they were in colour. Star Wars has a streak of the B-movie to it. So does Alien. But it's the movies which hitched a ride on the bandwagon which are better examples. You do know that Ronald Reagan might have starred in Casablanca</1>?