Honestly, aside from the model and coloration, the New Unfeathered Rex is inaccurate. We have indirect evidence from Yutyrannus. Just because a patch of skin fossils from the neck does not meat its completly unfeathered. Its like taking a patch of skin from Emu Legs and saying it never had feathers.
Trey the Explainer explains this better, but if the game is aiming for a realistic game, T-Rex needs feathers. Either keep the old design or add feathers to the new one. Maybe even better, when beginning the game save, you can choose if Rex has feathers or not, giving the player an option.
The rex is a Coelurosaur, a bird relative. Most, if not all Coelurosaurs had feathers covering some, most, or all of it's body