The clear answer from "Fritz" on 27 June 2024:

Hello,
Thank you for your enquiry and your interest in our products.
You are interested in the differences between the versions of the FRITZ!Box 4060.

There are no technical or functional differences between the national and international versions of the FRITZ!Box 4060. There are only differences in the scope of delivery, e.g. in the power supply units for use in different countries.

Information on the FRITZ!Box 4060 can be found at
https://avm.de/produkte...

The manual, knowledge documents and downloads for this FRITZ!Box can be found in the service area of our website:
https://avm.de/service...

AVM products are available from well-stocked electronics retailers in your area as well as from stores such as Saturn, Media Markt, Conrad, Expert and online shops such as Otto, Amazon or Alternate.

You can find a list of AVM specialist retail partners, including a search function by postcode, at
https://avm.de/produkte...

Kind regards from Berlin
Your AVM Product Consultancy

In the case of International, you then have the thick adapter on the power plug so that it fits into a Swiss socket.