Bands and cards all linked to one person are like different landline phones in the same house. (If anyone remembers what those are.) You might have one in the bedroom, one in the study, one in the kitchen, one in the solarium. You can pick up any one of them to make a call. But they are all connected to the same line. You can't use the one in the study to make one call and the one in the conservatory to make another call at the same time. You have one account with the phone company, you get one dial tone, and all the calls you make on any of the phones will be billed to the same account. Same with MBs and cards. You can use FP+ on your band, but your cards can't get separate FP+. It's the same dial tone for either one.
Any Bands or Cards
To make SDFP+ selections at park kiosks, you can use almost any bands or cards in your possession -- whether they are from a past trip or from a
future resort stay that is upcoming.
Provided, as always, that your bands are not clones from the hive mind of your primary MDE, yada, yada, yada.