Hey Bro, maybe I can answer your question...
The EU version is for European plugs such as Schuko plugs but not for the Swiss 3-pin plug. The International version works for almost all plugs in the world and also for the Swiss 3 pin plug (even if it is a bit cumbersome to plug in) for this reason I think it is more expensive.
I hope I have answered your question ;)
Wish you and everyone else who read this a stress-free day :)

On the following link you will find the essential differences. https://www.galaxus.ch/Comparison...