Although, the main thing you may get confused about is this (I will use our reservations as an example):
We are staying at AKL Dec 1-5 with 8 day park hoppers and dining plan.
Our AKL Key to the World card would have our room key, 8 day park hopper tickets and 4 night dining plan priviledges. Now notice that I am only staying 4 nights with 8 day park hoppers. That is more tickets than my stay at AKL.
We are switching to CSR Dec 5-9, 1 day base ticket (had to buy to get the dining plan), and the dining plan.
We are issued a new Key to the World card with our new room key, a 1 day base ticket, and the dining plan. The 1 day base ticket is to be used on the last day when we are leaving. We will have to use our old AKL card with the remaining park hoppers for the days inbetween (Dec 5-8).
The CM did say that when you switch to your second resort they could place them on your new key card. But I don't think I will do that since we will have the base ticket on there. Don't need them to get mixed up somehow. And I am sure that Disney could find a way to screw them up.