In the climax both wife and lover are admitted in hospital together and both give birth at the same time.. wife child dies and lover gives her kid to wife and leave the guy forever
Difference here is - mauli is aware of the cheating and kunal-nandini knowingly have the relation.. in the movie there were some circumstances which forced the husband to spend a night which was a mistake and later he couldnt deny the lady as he was guilty.. but till the end wife doesnt know about lover orneven doesnt know that the child is not hers!!