Actually PGs in game use the grens G43, no idea why just Relic
But the PG g43s which isn't being used by any infantry, from the top of my head alot better at all rangers compared to the gren g43s, don't hold me on that since I can't remember that stats of it, but I know they're better then the gren g43.
I don't know what you're looking at, but I'm actively looking through the attribute file. They use the pgren version. You can tell by either checking the attribute file itself, or you can check in-game to see the price cost. The gren version costs 45 munitions, and the pgren version costs 40.