What if, during WW1, it had been the Japanese in lieu of the Australian Naval and Military Expeditionary Force (let's say that it's never formed ITTL) who'd captured and occupied the entirety of German New Guinea and the Imperial German Pacific Protectorates instead, and the League of Nations had awarded Japan the mandate over all of these territories instead of just the Mandate for the South Seas Islands which it got IOTL. How much of an impact might this have had?