Grandfathering clause on LTCG applicable for HDFC shares post-merger?

I hold HDFC Ltd shares purchased before 31/01/2018. Post merger with HDFC Bank, these shares will be extinguished and replaced with HDFC Bank shares issued in July 2023. Now, if I sell these HDFC Bank shares, even though issued in lieu of my HDFC Ltd holdings, will I be entitled to the benefits of grandfathering clause for LTCG or will the date of acquisition of these shares be taken as July 2023?