Yes ...Would it be possible or likely for the USSR to annex more of Europe into the USSR under these circumstances?
Although Paradoxically, this Will ONLY Happen if they Don't have as Many Buffer States as in OTL ...
On The Other Hand Poland is Likely to Remain The Most Restive Member of Any Communist-Based Eastern Bloc; Proximity to The Border and an Emphasis of Marxism Over Catholicism Will Just Serve to Exacerbate The Situation!