The physical layouts are the same. You define the layout in the operating system. The only difference is whether the key defaults to ä or à without pressing shift. Same or any other characters. Works on Windows and Linux.

Checkout the answer given for this keyboard: Logitech G G610 Orion Brown (no longer stocked).
Logitech G G610 Orion Brown (USB, CH, Cable, MX Brown)
The question was "Do you have the G610 in Swiss-French (èéà) or only in Swiss-German (üöä) ? Thanks"
The answer given was. "There is no Swiss-French or Swiss-German layout, there's only Swiss (CH)...."
The details why are also provided. Its the same answer for the K280e.