Michael Bay directed both The Island and Transformers 3: Mark of the Spoon, so I guess he's allowed to rejigger a chase sequence from the former for the latter. Watch as Bay's 2005 clone saga becomes stock footage.
I prefer to view this not as a cost-saving measure, but as evidence of Michael Bay trying to put The Island in Transformers canon, sort of like the way the Mazes and Monsters cover art was redrawn after Tom Hanks became famous years later. (Yeah, I realize that analogy made no sense, I just saw a billboard for Larry Crowne.)
Anyway, I betcha there's a nixed Island director's cut of Ewan McGregor turning into some form of funicular transport and Scarlett Johansson evolving into a dirtbike.