The price quoted on VTG for an inside cabin is usually the Carnival advertised price for a 1A cabin. If you booked anything other than a 1A cabin it is not the same thing and would not qualify. Same rules would apply for balcony.
50 Carnival: Mardi Gras, Ecstasy X2, Fascination X6, Celebration, Elation X5, Glory X4, Fantasy X4, Valor, Holiday X3, Imagination, Liberty, Spirit X2, Freedom, Destiny X2, Splendor X2, Dream X2, Conquest, Legend X2, Victory, Sensation, Paradise, Inspiration, Magic X2, Triumph, Miracle, Breeze
5 Norwegian: Sky, Jewel, Dawn, Epic, Pearl
6 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant