Heck, I might as well postulate my own as well as the polish scenario pic.
The polish one is easier. Hitler in that reality tooled the NSDAP's ideology to be more anti-communist and anti-french than anti-slavic (His anti-semitism here is about the same). While still going with the idea of lebensraum (a westward one like the Franks once did), he decides to simply leave off the Danzig Corridor and Poznan off the realm of Germany. He does this seeing as the latter is a decent deal more Pole than German, while in this reality, far more Germans from the corridor moved to either East Prussia or Brandenburg during the 20's.
As a result, Hitler is fairly ambivalent towards polish subjection and would prefer a buffer against the Soviets. Timeline marches about the same to 1938, where he absorbs Austria and the Sudetenland diplomatically. This gives Stalin the idea of annexing the Baltic States (With a Lithuanian exception thanks to German posturing against such a thing). This antagonizes Poland against the soviets, and as a result they go to the German camp.