Hello Liv1
Thank you for your query.
The validity is the same for both day passes. And both are valid up to the Rigi.
The difference: You can always buy the day pass with the Half-Fare Card and the price is always the same (condition: you must have a valid Half-Fare Card).
The Saver Day Pass is a reduced offer from us that is available in different price levels. You can buy it maximum 60 days in advance until 1 day before the day of travel. It is available for travelers with or without Half-Fare Card (different prices).
The Half-Fare Card is a card that entitles you to purchase regular tickets at half price or day passes at a reduced price in case of special offers.
Detailed information on all offers can be found online on our website: www.sbb.ch
I wish you a pleasant stay within Switzerland.
Kind regards,
FatimaH