Theoretically a '46 could fly unrefuelled one way from California to new South Wales, granted with out fulfilling it's primary mission, but taking on fuel from other tankers was even part of the KC-767 vision. Like all DoD program(me)s, it's all up for grabs until the pork gets allocated by Congress, as was reflected in the voting when members of the HASC failed in their attempt to get a mandatory full and open competition for the Bridge Tanker written into the fy23 DoD budget last June; those in favour promised to be back for another go this year. Those with Boeing supply chain constituents outvoted those with potentionally LXMT supply chain constituents.
From what I understand the Boeing offer for the Brige Tanker would be an enhanced and higher priced (i.e. profitable this time round) KC-46"B".