OTA Update Query

I recently flashed android 5.0 to my Samsung Galaxy S5, it was a polish build for the SM-G900F which successfully installed

Today I heard that an updated version was available for again people in Poland via OTA, I decided to check if it would work for me as I live in the UK

It turned out that I could in fact get the update, I was wondering how this is possible as the OTA updates have not been released for UK