The Fast and the Furious
After Dominic Toretto parks his Mazda RX-7 in a parking garage and starts to walk, a police officer in a Ford Crown Victoria spots him as he passes him. The officer immediately turns the car around and calls out to Dominic, telling him to not move, but the car changes from a Crown Victoria to a Chevy Caprice when the cop turns the car around.
2 Fast 2 Furious
The Miami police officers who chase Brian O'Conner and Roman Pearce near the end of the movie use both Ford Crown Victoria's as well as Chevrolet Caprices, although all the interior shots of the police vehicles are taken from Crown Victoria's.