I believe the info in the driving band only references who made the projectile. The company that loaded the round would have stenciled their info on the projectile (their code, lot numbers, etc.).
This is the info on the driving band of the round I mentioned above:
On the same round, this is stenciled on the projectile in white ink:
So Harvey Aluminum made the projectile on my round, and Lake City loaded the complete round.
There should also be manufacturer/lot info stamped on the side of the case by the case manufacturer, but this often wears off.
If you’re looking to restore the markings, while there’s probably no way to determine who loaded the round, LC would probably be a safe bet. I don’t have a ton of 20x102 rounds, but the majority of mine seem to have been loaded by Lake City. Then again, that could just be because I’m in the US!
I hope this helps!