edovillegas No cancellations are possible for Super Sparpreis, but, when you buy your tickets on bahn.de, you can cancel the tickets within 12 hours (720 minutes) after the purchase.
I don’t know if it is also possible when you buy the tickets on sbb.ch. You can ask the Contact Center:
Tel. 0848 44 66 88
(CHF 0.08/min.)
(available 24/7, sometimes you may be required to wait)