Sudarshan is autonomous radar guided upgrade to L70 vs plain Upgraded L70 has optronics added and someone still has to man L70
L 70 is air defence gun platform common in both. Sudarshan is more autonomous and is meant to be deployed in chains. My guess is one Sudarshan system can handle multiple autonomous L 70 - so that multiple designated targets can be engaged from same command center.
Now both systems man in loop and autonomous - have their advantages and disadvantages. With autonomous we are concentrating everything in one command center. If that gets taken out (as see in Hq 9) - you render all guns linked to it useless unless they get hooked to another command center vehicle.