Shoot your shot. It’s a 4 lpa difference so be ready to loose it if you really want to join company A.
Your pitch should be to the HR saying -
Hi esteemed HR person,
During the course of my job hunt, I have received a competitive offer from an organisation which is X lpa. While the offer looks good monetarily I am still interested in joining your org due to xyz reasons. So I wanted to check if you would be having some room to match the offer or offer other perks like JB, higher RSUs, more paid leave etc. Again reiterate the interest in the organisation.
The negotiation will depend on a lot of factors. Their budget, and competing candidates, ego, etc. But they will not try to loose on a good final candidate for a couple of lakhs.