Similar situations, but different in the sense that Russia took Poland from a position of power, while GB/Fr gave up Czechoslovakia from a position of weakness and didn't make any territorial gains from it.
Territories, annexed from Poland, had majority of population Eastern Slavs (Ukrainian and Belarussian), not Poles, were part of Russia for hundreds of years (except Galicia) and were annexed by Poland from Russia (Galicia from Austria) 20 years before.