Voyager KC Mk 2 has 2 wing pods, Voyager KC Mk 3 will have 2 wing pods and a single centreline fuselage refuelling hose unit.
Both are based on the standard A330-200 airliner, as is the RAAF's KC-30A which has 2 wing pods and an air refuelling boom; it also has the capability of receiving fuel in flight which the UK's Voyager does not.