EVERY device maker works with the production lines to tweak the reference design of a component like a display to the desired specs. That is how modern manufacturing is done.
An example of this process is Gorilla Glass. While the end product is always called Gorilla Glass, the material for a given device is tweaked. The gorilla glass in a Galaxy device has a different process and characteristics than a Galaxy Note, or iPhone.
We can't point to exactly what Apple, or Samsung, or anyone else for that matter has done (usually given trade secrets for an excuse) but you can bet your ass that Apple got the exact display they were working towards.
To question that is to not understand how modern manufacturing is done. Infrastructure exists, then is tweaked to exactly what the component purchaser is looking for...assuming they can pay for it.