it does more damage due lower suppresion. it wont pin instantly like an mg42 and therefore the squad which is shot at wont get the -50% recieved accuarcy bonus from beeing yellow suppressed.
Technically though, I'm pretty sure pinning doesn't cause give them a received accuracy bonus anymore.
And of course, HMG42s also can't actually pin instantly unless you're right next to them, thank Quinn.
TL;DR Pointless pedantry