'Lambi Judai' is a song from the 1983 film 'Hero' starring Jackie Shroff and Meena Kumari. The song's title refers to prolonged separation, which is a central theme in the film. Kaamchor, Kabhi Kabhi, and Karz are different films - Kabhi Kabhi (1976), Karz (1980), and Kaamchor (1982).