en.wikipedia.org/wiki/Peter_Clemenza

The infobox labels The Godfather: The Game as Peter Clemenza’s "Last appearance," but Clemenza appears in a later Godfather work: Ed Falco’s The Family Corleone.

Two independent sources describe Clemenza as a character in The Family Corleone, and both place that book in 2012:

• Kirkus Reviews says of The Family Corleone (release date May 8, 2012): "Peter Clemenza is Vito's capo ..." That directly shows Clemenza appears in the 2012 novel.
• The Bulletin / Newsday review of The Family Corleone (published May 20, 2012) says: "welcome back ... Clemenza ... in 'The Family Corleone.'"

Because The Family Corleone was published in 2012, it is later than The Godfather: The Game (a 2006 game). So the game cannot be Clemenza’s last appearance in the franchise by publication/release date.

This sentence misidentifies the voice actor for Peter Clemenza in The Godfather (2006).

Multiple independent cast/credits sources list Doug Abrahams — not Jason Schombing — as the voice of Clemenza:

• IMDb credits Doug Abrahams as "Don Vito Corleone / Clemenza / Capt. McCluskey / Jack Woltz (voice)" for The Godfather video game.
• Giant Bomb's credits page lists "Doug Abrahams - Vito Corleone/Captain McCluskey/Pete Clemenza/Jack Woltz" and separately lists "Jason Schombing - Marty 'Monk' Malone."
• Doug Abrahams' own voice-work page also lists "Pete Clemenza — God Father Game" among his video-game voice roles.

So the game did reuse Castellano's likeness with permission, but the replacement voice actor for Clemenza was Doug Abrahams, not Jason Schombing.