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Single White Female is necessary research for my film as it is has a similar plot.

Allison the main character places an ad for a roommate and brings a stranger into her life.
She interviews a succession of unsuitable candidates before settling on the shy Hedra "Hedy" Carlson, who in Allie's eyes, is the ideal roomie.
But soon after Hedy has her hair cut and dyed to match Allie's look, resulting in a startling resemblance between Allie and Hedy. Hedy, who had undergone futile counseling, had been looking for a female companion so she could have a friend to replace Judy her twin sister, who had drowned as a child. That's why Hedy tries to look exactly like whatever roommate she has at the moment... so it would be like She still had a twin sister.

This is research for my film (Dead Ringer) as it resembles an already established thriller. My film will have a set of twins, but the jealous sister has always wanted to be just like her twin. Envious and angry the sister will take her revenge upon her twin.