Why it's similar — The direct sequel doubles the original's structure: Robert De Niro's young Vito building the family in 1910s Little Italy while Pacino's Michael runs it into the ground in 1958 Lake Tahoe and Havana. The film is the rhyme the closing door of Part One was already pointing at — the door has been shut for fifteen years by the time Part II opens.
Why it's similar — Coppola's late-period coda picks up the same theme of one-generation legitimisation that Part One refused to grant Michael, then watches the older Don try to buy it through the Vatican. The Sicilian opera-house climax is the long-form answer to the closed-door geometry of Part One — same family, same church-and-business cross-cut, decades later.
Why it's similar — Ridley Scott's J. Paul Getty kidnapping drama works the same theme of family money as a structural prison — the patriarch who will not pay his grandson's ransom is operating by the same Sicilian-American honour calculus the Corleones built their empire on. Christopher Plummer's late-replacement performance carries the cold-room dynastic register Brando defined.
Why it's similar — Robert De Niro's directorial debut and Chazz Palminteri's stage-play adaptation work the smaller, neighbourhood scale of the same Italian-American world. A father and a local capo competing for a boy's allegiance in the 1960s Bronx is the inverse of the Vito-Michael relationship — same neighbourhood, same questions about which family a son belongs to, but at street level rather than Don level.
Why it's similar — Scorsese's Vegas epic is the operational sequel the Corleones' Moe Greene subplot was pointing at — the same mob money moving into the same desert, photographed with the same patience, with the same closing-act unraveling of an outwardly legitimate front. Pesci's Nicky Santoro is the Sonny Corleone temperament let to run its full course.
