Perth Zoo has only ever held one Fishing cat (the male you mention). His name was Wayan and he was born 24/11/1997 at Melbourne Zoo. He transferred along with his brother (Jharna) to Adelaide Zoo in 2000; before transferring to Perth Zoo 27/07/2004. He died at Perth Zoo 12/08/2008 and they have not held the species since.
It’s difficult to say which Temminck’s golden cat attacked Fiddle, especially not knowing what year it occurred. Nugi, who was there from 1992 to 2002 is a strong possibility. His brother, Hari, also lived at Taronga Zoo from 1992 to 2000. He was noted to be unusually placid for a male of his species (when introduced to Auckland’s female), though I doubt that would extend to turning down an opportunity to attack a smaller felid.