The Key, which doubles as a Player's Club card, is different from one of the Koningsdam cards in that the P/N number is different, and there a symbol at the lower right face. But, I think that symbol may indicate a tier-level of cruise status. I will have to check.

The 2nd card shown (both sides) was a card that Room Stewards used to hold the cabin lights in the ON position. They have a holder device mounted to the wall, just inside the doorway. When you open the door, no lights are ON. You have to put your Room Key in the device, which then allows you to use any of the room light switches to turn on the lights. The Room Stewards use this generic card to fullfill this function. I used my Boyd Gaming slot card. Out of concern for forgetting my room key in the holder.

Light Switch Card