While losing a war is highly stressful, I think it's silly to assume that in victory, Hitler's cabinet will somehow be saved from their own deep character flaws. Goring will still become a blubbering heroin junkie, and that lot will feed his habit rather than clean him up (NO ONE wants a sober, clear-thinking Goring on the loose). Himmler is insane, grasping, and has the temerity to have been a farmer in a society that was still very class conscious; I expect him to outlive Hitler by mere months if not days, and that's assuming one of his subordinates doesn't kill him while Hitler is still alive. If Heydrich has survived the '42 assassination, Heydrich; if not, Kaltenbrunner.
Speer will be leaving government the day war ends, although he'll no doubt get a lot of government contracts in his architectural practice.
In victory, Hitler has no reason to change his will to anyone but Goring, even if the latter is too strung out to remember his own name. Not that Hitler's will would have mattered in victory any more than it did OTL.
I'm going to assume a German army will be relatively content and professional in victory, and thus not stage a coup. That brings it to a contest between Martin Bormann, who's basically running the civilian government, and whoever's running the SS (probably Kaltenbrunner). My money's on the SS man. Goebbels is too spineless to wield executive power, and I don't think the SS man will feel the need for a figurehead (and Bormann isn't smart enough to realize he needs one).