The devices are technically identical, except that the International has different packaging and supports other languages. Because Fritz is more at home in the German market, this probably results in a higher sales price.

Good question. And to be honest, I don't know either. But: The only difference could be the 230 V power plug that comes with it. It's possible that where it doesn't say "CH", it has a Schuko plug. But: 1. if that were the case, Digitec would have to give you an adapter that fits the Swiss standard. 2. it is probably only a two-phase plug anyway. It fits all sockets in the EU and in Switzerland. Maybe someone knows more about it? (Maybe the CH version understands Swiss German better? ;-)