Swap Those Movie Casts

[garygnu]

Can you think of two movies where the primary casts could fairly easily take all the roles (or at least most of them) in the other movie? Fairly recently I watched Clue: The Movie a day after watching Noises Off. Same number of principle actors, similar roles available in each movie. The swaps wouldn't necessarily role-for-role:

Michael Caine as Wadsworth : : : Tim Curry as Lloyd Fellows
Carol Burnett as Mrs. Peacock : : : Eileen Brennan as Dotty/Mrs. Clackett
John Ritter as Col. Mustard : : : Michael McKean as Gary/Roger
Christopher Reeve as Mr. Green : : : Christopher Lloyd as Fredrick Dallas/Phillip Brent
Marilu Henner as Mrs. Scarlet : : : Leslie Ann Warren as Belinda Blair/Flavia Brent
Nicollette Sheridan as Yvette : : : Madeline Kahn as Poppy Taylor
Denholm Elliott as Prof. Plum : : : Martin Mull as Selsdon/The Burgler
Julie Hagerty as Mrs. White : : : Colleen Camp as Brooke/Vicki
Mark Linn-Baker as Mr. Body : : : Lee Ving? as Tim Allgood

OK, so it isn't perfect. Your turn.