Today I updated the polygon data for USA and Czechia. The scripts comparing old and new doesn't flag anything. For USA it's just some tweaked borders and really shouldn't affect anything, except that a single digit geocaches will be moved from one county to another.
For Czechia it's recent changes from their government. A county got larger since a few land areas now belongs to that county instead of another. All names are still the same and I do not think it affected any connecting neighbors, at least not from what I could see. This is the information I received from Czechia:
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Example: vilages Bukovec, Čečovice, Černovice, Holýšov, Horní Kamenice, Kvíčovice, Neuměř, Štichov, Všekary moved (changed) from county Domažlice into county Plzeň-jih.