ERROR ON MY PART: I am not on this forum very often, ergo the confusion and not knowing about them being sisters. However, they look uncannily similar, even for sisters!
I actually don't watch this show religiously, but do enjoy the Atul-Anjali storyline, and I catch up through music videos about their relationship. However, I have been wondering where I have seen Ridhima before, and she looks so much like Sakshi Shivananda from Aapko pehle bhi kahin dekha hai! Here's a music video and some pictures of Sakshi. What do you guys think? Agree or disagree?
https://www.youtube.com/watch?v=U2mtIp3W198
This video reminds of the dance between AR when R was in the red dress!
https://www.youtube.com/watch?v=8Phr9doxq5g
Saakshi's innocence is very much like the innocence and cuteness reflected in Ridhima!
Okay, if the dad in both pictures was Mohnish Behl, I don't think I would be able to tell the diff. between Ridz and Saakshi.

Uncanny resemblance. I seriously thought it was Saakshi when I first started watching this show.