So I never saw the original but a lot of people said the sneha and bajaj bond was beautiful here is hoping they do the same here.
So we all seem to assume sneha is alive somewhere. She grew up without both parents. Anurag and komolika has a child. Anurag despite hating komolika and saying that their child was a mistake; diya is still his child. He raised her. So when anurag comes to know about sneha being alive he might have to make a choice.
But given that anurag thought bajaj was the father and not to mention him finding out prerna was living with bajaj all these years will again put doubt in his mind. A doubt that he will not accept her again hence bajaj fulfilling that role as a father in sneha life.
Prerna doesn't even know about diya. When she comes to find out she will be crushed.