Based on these screen caps, the ring on the right hand "ring finger" (or, in other words, the finger next to the little finger) appears to be the same across the films.
According to VEF, Katherine is aka Camilla Jones aka Isabella... The picture at bgafd is not a great match, frankly. But the "Katherine & Ivy 2" title ID is definitely accurate. The Fiona Cooper synopsis identifies Ivy as Austrian. Katherine & Ivy 2 (V962) Tall & leggy Ivy plays with the little ...
Your loop is from CC Pussycat loop 516, "Cock Fever." Perhaps you've seen it, but that came from this unsolved VEF model ID request thread, which has alternate aliases and links to some different posts for the actress you've asked about. http://vintage-erotica-forum.com/t278386-seen-in-cc-and ...