The Japanese would have been equally brutal as per OTL in the occupation of the Philippines in TTL, which follows the same up until 1944 when the Allied landings is in Luzon rather than Leyte. There'd still be equivalents of the Manila massacre, comfort women, POW executions, and infanticides.
The Filipinos and the Vietnamese would have been appalled seeing those mass graves of Jewish, Slavs, and Gypsies once the true horrors of the evil of Nazis have been exposed. Since the Filipinos and the Vietnamese fought in mostly a jungle environment with limited urban combat, I'm guessing there was a change in doctrine in some point.
But could witnessing the horrors of Nazi rule reawaken trauma in these soldiers from the days of Japanese rule? And, like a lot of people, would these soldiers be crestfallen seeing a civilized European state sinking so low into such barbarity?