Instead of Molotov and von Ribbentrop splitting Poland, Russia and Poland can split the Ukraine this time. Poland will get back the lands stolen from them at the end of WWII; I doubt that they’ll bother to return the stolen German lands.
I am interested as to what Poland considers the western Ukraine - maybe run the border along the Dnieper river. That would be a bit further east than the 1939 borders. Maybe just Volhynia and Galicia. That shouldn’t get it as far as the Dnieper until somewhat north of Kiev.
Poland is not going to do that. Only Russia wishes to grab territory from its neighbours