I don’t remember the designations, but I have thrown both those types. The OD is frag, and should have a screw in the bottom. Hope it is inert.
The blue one should have an unthreaded hole in the bottom, and is a practice grenade. We used to fish the little powder bags out of them and then just pop the fuze trains - the higher ups didn’t want the paper work of turning in live ordnance (and these are considered that) not used up in training. The “heroes” just held the hole pointed away from their face and popped the practice ones without taking out the powder bags. I nevr tried that - I am not adventuresome.
Of course, you see in “collections” the practice ones painted in all sorts of colors. OD is common, to represent frag grenades. No matter in California. I am sure you will be surprised to find out that both types are illegal here. In fact, as far as I know, even any given part, except maybe the pin, is illegal in California. But then, so is everything else. Soon it will be illegal in the “Golden State” to breathe without the legislature’s permission.
When they passed the law, I had a plaque on the wall with a totally inert (fired) practice grenade, still blue, not even repainte, with the saying on the plaque “To register your anti-gun vote, pull ring once.” I have to cut the thing up completely and throw it away. After all, we all know that plaque was a real danger to society - just short of a nuclear device!