This tag is wrongly used here as it's not 3DCG, just 3D. Well, at least it's not 3DCG as it's defined here on this website as factualy 3DCG is just a regular 3D game, a mean of rendering 2 dimensional image as 3D.
My good sir, most
(if not all) 3D games utilize 3DCG...
Not all games with 3DCG are 3D games, however.
3-Dimensional, Computer-Generated.
Usually the term is used for
blatantly 3D models, such as those in Unity, Unreal or the like.
More realistic models get around the 3DCG label because it's something of a
style rather than a type of game, per se.
TL;DR
3D is the game's format.
3DCG is the artstyle/character-modeling of said game.