1. The Godfather Part II (1974) - De Niro plays a young Vito Corleone, while Pacino plays Michael Corleone.
2. Raging Bull (1980) - De Niro stars as Jake LaMotta, while Pacino plays his rival, Joey LaMotta.
3. Heat (1995) - De Niro plays a seasoned thief, Neil McCauley, while Pacino plays a dedicated detective, Vincent Hanna.
4. Sleepers (1996) - De Niro and Pacino play old friends who are reunited after years of being separated.
5. The Score (2001) - De Niro and Pacino play aging criminals who plan a heist together.
6. Righteous Kill (2008) - De Niro and Pacino play detectives who team up to solve a series of murders.
7. The Irishman (2019) - De Niro plays Frank Sheeran, a hitman who claims to have been involved in the disappearance of Jimmy Hoffa, played by Pacino.
8. The Untouchables (1987) - They are not in the same scenes, but Pacino plays Eliot Ness, who arrests De Niro's character, Al Capone.
9. The Fan (1996) - They are not in the same scenes, but Pacino plays a retired baseball player who is stalked by De Niro's character.
It's worth noting that their roles in The Untouchables and The Fan are brief and they don't share any scenes.