It was a Yash Chopra Romantic film featured by Sridevi n Anil Kapoor.
Anil Kapoor's character falls love with Sridevi Sr. character n marries her daughter Jr. Sridevi😆. (something like one marries his daughter figure)😆
Even though Anil character madly love with Sr.Sridevi,she married another boy and gave birth to a daughter. After that she n he died in an car accident. Anil Kapoor who was truly loved Sr. Sridevi decide to never get married n leading a life on her memories.
Sridevi Jr.,, a look like of her mother falls for Anil kapoor's character n wanted to marry him.Since she was daughter of Sr.sridevi who he loves even now reject her proposal.
But the climax of movei is Anil Kapoor character is marrying Sridevi Jr. who was his beloved lover's daughter ( For him she is a daughter figure).may be if he was married to sridevi sr. , their daughter should be like sridevi.jr.
Here in MB there is no such a relation between MB2 n raju.
It is not a new themeactually, there r somestories where male lead lead falls for daughter of once his beloved. I have read a novel where a girl falls for a man who was her father's same age to her n last understand he was her mom's lover when they were together in thecollege n living now with her memories. He make understand her n forcefully send away from him when he understand she is his lover's daughter who some what look-like her( not exactly look-like).
So look like is not a problem at all as many literatures have the same storiesincluding movies.