Your KTTW is your room key and you can have your park admission tickets added to the KTTW. If you purchase the dining plan, everyone in your party will have the dining plan credits included on the KTTW.
However, you cannot put an AP or PAP on a KTTW. They must remain separate. Probably because of the expiration date and name preprinted on the pass.
So, your room card may be your park ticket if you have your tickets placed on the room card. I'm not sure what you mean by "current card".