Hoat and OAT coolant are not the same. While they both keep your engine cool, they work in different ways.
OAT coolant uses an organic acid to protect your engine from corrosion. It's designed to last longer than traditional coolants, but it can't be used in all vehicles. Check your owner's manual to see if OAT is right for your car.
Hoat coolant uses a hybrid organic acid technology. It mixes traditional antifreeze with an organic acid inhibitor. This creates a more effective cooling system that lasts longer and protects better against corrosion.