Similar: The main characters are the same in both versions of this story. They include: Katniss, Gale, Peeta, Finnick, Haymitch, President Coin, President Snow, Boggs, Prim, and Plutarch.
Different: Plutarch, a game-maker, had a bigger role in the movie then the novel gave him. A character who was mentioned in the book but not the movie is Delly, a girl from district 12. In the book she talked to Peeta when he was still in the hospital to try to reach him and help him understand. In the movie Prim had this role to help Peeta.