If it is like the AFA, it is a queue. First in first boarded, your MOC, state, region does not factor into when you are boarded. Nor does it matter for charging purposes. What does is that every nom on the slate must have a WCS before the MOC can be charged if they are using a competitive method. If principal, than as soon as they have a WCS and fulfill the requirements (3Q) that appointment is given and will be charged.
~~~ If competitive, than if MA 61's {SR sen} slate of ten have all been given their WCS, but 62 only has 9 with a WCS out of ten, they can/may appoint someone from 61s slate before 62s. The other 9 from that slate may be on 62 and when that tenth person submits, than 62s appointment may be decided.
I say that because in states where they duplicate noms the admissions board may take longer because now they have to work in the factor that the candidate could theoretically win all three, but can only charge 1 MOC, this has a domino effect on the remaining two slates, and the number two on both Sen could be number one on their Cong. Thus that than impacts whether to charge them to the Sen. Or their Cong. So on and so forth.
~~~ It is also why some talk of how 8 out of ten on the slate get an appointment.