This isn't just about bigger numbers. To handle tricky engine vibrations at sea level, ISRO used smart fixes like a Nozzle Protection System and multi-element igniter.
The upgraded engine is intended to increase LVM3's payload capacity to geostationary orbit and Gaganyaan missions would gain more flexibility from multiple restarts and reduced reliance on additional start-up hardware, which can help limit payload penalties.
It's another step up for India in the space game!