Katarina started out with blonde hair then dyed it red. She's had her tits done and reinvented herself as a blonde. Look at the eyes and the shape of her nipples, it's definitely the same woman.
Dorothy Black did the same thing - she started out as a brunette with blue eyes - now she's a blonde with brown eyes (contacts) and a heavy tan. I didn't think it was the same babe, but it is.