there were dozens of battleroyale type games that predate PUBG with near identical looting + random circle collapsing inward mechanics, most floundered.
I'm not sure what the other ones were, but for the popularly referenced Battle Royale modes in H1Z1 and DayZ, they originated from mods by the PUBG creator.
That being said, both the games you reference, their Battle Royale mode was actually made by the creator of PUBG:
> Brendan Greene, also known as PLAYERUNKNOWN, is the creator of the Battle Royale mod that started in the DayZ mod for Arma 2. Recently, Battle Royale has been licensed by SOE and made an official game mode in H1Z1
