Catan Card Game and Rivals for Catan are not identical; according to BoardGameGeek, the designer (of both) said that he reworked many of the original card game's mechanics for Rivals to make it easier for newcomers to play. Both are 2-player only and shouldn't be confused with the 2-4 player card game The Struggle for Catan (which wasn't rated as high as the 2p versions by BGG users).
(Also, Monopoly Millionaire Deal over Monopoly Deal, hands down.)