Which Indian Bollywood film tells the story of identical twins separated at birth?

Seeta aur Geeta ("Seeta and Geeta") is a 1972 Indian Bollywood comedy-drama film, written by Salim-Javed (Salim Khan and Javed Akhtar) and directed by Ramesh Sippy. It stars Hema Malini, Dharmendra and Sanjeev Kumar in leading roles, and features music composed by R.D. Burman.

The story is about identical twins (played by Hema Malini) who are separated at birth and grow up with different temperaments. The twins then swap places (like The Prince and the Pauper). The two sisters' partners in the movie are played by Dharmendra and Sanjeev Kumar. Manorama plays the evil aunt who changes her tune after her arm is twisted (literally). Furthermore, Hema Malini was noted for the novelty of her role as Geeta where she is rambunctious and sometimes violent.

The main theme of this movie was copied from the superhit Tamil movie Enga Veettu Pillai starring Superstar M. G. Ramachandran. As hinted in the Wikipedia page, it is said that the producer of this movie B. Nagi Reddy was furious with Salim-Javed for copying his story and hence he went on to quickly move on to making remakes in other languages include the Telugu film Ganga Manga (1973) and the Tamil film Vani Rani (1974), both starring Vanisri in the dual roles.