They are 3D models with fewer polygons, just like the original models in the game. In this case the model on the left has fewer polygons than the one on the right, the model on the right is part of the definitive edition models which received a "remaster" so the models look much more defined than the of the classic version.
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In this case the model on the left has fewer polygons than the one on the right, the model on the right is part of the definitive edition models which received a "remaster" so the models look much more defined than the of the classic version.