Hello Danhiel @JPvdw
The Saver Day Pass is not the equivalent to the GA Travelcard. The Swiss Travel Pass is, however.
The Saver Day Pass is not valid for mountain excursions (with very few exceptions; thus, one cannot declare the GA travel card when holding the Saver Day Pass). It does not grant any reduction unless the customer holds the Swiss Half Fare Card in addition.
@JPvdw The Saver Day Pass is only valid for red, yellow, and blue solid or dashed routes, not for dotted routes. See the validity map here:
https://sbb-tickets.cc/content/dam/internet/sbb/downloads/en/billette-angebote/abos/Geltungsbereichskarte.pdf.sbbdownload.pdf
Kind regards,
Roland