Hi Jason, here's what Support said:
Unfortunately there is no documentation on the Organization Administrator role, but in regards to what it can do, the Organization Administrator role is a role that can modify and change any user rights in regards to assigning FC profiles, in regards to the Organization role there would be no reason to as this is the Admin account and can already oversee everything. Now if the user is trying to assign certain rights to Admins, he can create an Admin role and assign Fc profiles to this new role.