exchanged? no, but you can find them in the ticket if you're lucky enough.. at least I think.
the gacha contents are all the SSR hime weps/eidolons of that specific element so there's a higher chance you finding the 100% eidolon of that element than in other normal draws.
though, someone did say that those SSR element gacha tickets contain only kami weapons and no eidolons
but no, you can't "exchange" the tickets for anything.
not sure if this is just the kami tab, or the overall tab?