Exactly correct. PS is noncorrosive and KA (Korean Arsenal) ammo is corrosive. No problems feeding your Garand with this ammo...I have some of that exact same stuff and I'm pretty sure PS is noncorrosive. The KA headstamp stuff is corrosive. If it's M2 ball it should be fine in a garand.
Not doubting what you say, but I have not heard of any KA 30-06 ammo being non corrosive. I guess it wouldn't surprise me terribly but I just haven't heard of it before. Rather than keeping a lot list handy, I'd just recommend that one always clean up afterwards as though one shot corrosive ammo. It's no big deal and no regrets.......Some of the KA headstamp is corrosive some not can't find the lot list right now