This piece is intended to be allegorical. "Red", the charging Styracosaurus is the attacker, "Blue" - the other one - is the defender. Styracosaurus present a large variety on their frill horns, so I coud have sculpted different horns for different animals.
Also the different colors - the classic dicotomy red and blue, is absolutely not common among animal of the same species. In my piece the animals are of the same sex, so sexual dimorphism is escluded.
These are artistic choice and I like ti play with them if I am satisfied with anatomy and proprortion.
Hope you like this piece for 3D printing, available on my Patreon: https://www.patreon.com/vfb_paleoart