Other territorial changes in Europe were at the expense of the Axis (Poland lost territory but was compensated from Germany; the Baltic states had been absorbed in 1940).
Strictly speaking, the great majority of the land the USSR annexed in Europe as a result of the WWII era had been conquered already before the beginning of Op. Barbarossa, at a time when Stalin was de facto allied with Hitler - Eastern Poland, the Baltic states, parts of eastern Finland, Bessarabia. Practically only Kaliningrad and Petsamo were annexed by the USSR from Germany and its allies after the war, without having already become parts of the Soviet Union by 1940. But being on the winning side, the USSR still could keep its originally ill-gotten gains by default. They had been, after all, already annexed by the USSR de facto and in Moscow's view de jure, too.
In Norway and Denmark, though, the USSR was only temporarily since 1945, to beat the German occupier and to help the locals. Like you said, Denmark was not an Axis ally at any point, but a straight-up victim of German aggression. We can argue that there was a tacit understanding between the USSR and the Western Allies that the occupation would have to end in the near future after Germany was beaten. This temporary occupation of parts of Norway and Denmark was thus very different from the Red Army presence in other parts of Eastern and Central Europe, where the postwar Soviet occupation took place in agreement with the Western Allies, even if that agreement was certainly grudging.