I'm not a moccodity!
Per this, sounds like you're right on the alt. art:
Included in each of the 7 Wonders OP kits is a stunning Art Pack that features new alternative artwork for seven of the original Wonder boards with both A and B sides to them. A new promotional version of the 'Palace' card with new artwork by Miguel Coimbra and a 7 Wonders playmat that will help structure the play area and set-up of the game.