I work for a Polymer and Tire Producing company and I can tell you that the tires on original equipment vehicles are indeed different and better than what you can buy. Tire company have OE production lines and and even OE production plants making tires foe new cars only that private consumers cannot purchase. The compounds for OE tires are tailored for a specific model vehicle and have unique coding.
When a cusomer replaces OE tires, they are not buying the same exact tire. It is the brand, make, model, size etc, but it is not equivalent to OE.
So when Ford says ot was developed for the Raptor, this is not much different than what other companies are doing for say a Yukon or a Cadillac.
If the OP plans to purchase an aftermarket tire he should choose whatever suits him as an agtermarket KO2 will not be the same as what is on the Raptor or any other OE vehicle for that matter.