If I look at both pictures it is the Logo of the Rhone Route with a small additional EV17 logo in the picture of @nurdafur and that of ViaRhôna with a small additional EV17 logo in that of @StC.
The Rhone Route page states clearly:
At the ViaRhôna page and stage descriptions I did miss such a reference, but I saw that they referenced the R-1 for the Swiss parts
And there’s the need of local knowledge about the small part between Le Bouveret and Saint-Gingolph (6.4 km) too. I’m sure this will be the final form of the EV17 signs, a bit different from other EV routes that I’ve seen, i.e. EV4, EV5, EV6, EV15.
Will it have an impact of the mapping? What do we do with that?