With the assembly there is a kind of guideline of how far the piston needs to go into the sleeve until the pinch comes in. If it is in a certain window then it is ok. If not then another piston or sleeve will be tried.

But there is also a perfect height what makes the break-in easy with just taking away the piston its surface roughness with not too much left over pinch or a too low pinch.
If you have several normal engines new out of the box you will notice differences in the pinch, if you have engines with a selection proces from Ielasi, MAX or the early JP then all will have a same height where the pinch comes in.

During the assembly this perfect fit is easy to put aside for the goldhead engines.

I can not say this is really done at OS but several engine brands do select P/S matching sets so there is a highly chance the more expensive goldhead does have selected P/S sets.