Netflix Combo pack will get attached on your Primary connection. The current Binge subscription on your Secondary Binge+ box (or Firestick) will continue as it is. The linear content which is part of your Netflix Combo pack will get mirrored to your secondary connection on DBR basis (if you have opted for MultiTV Mirror = Yes). There will be no impact of Netflix Combo pack on secondary box if you have opted for MultiTV Mirror = No.