Except its not center X. Its a different velocity which means a different run/lines. No one knows if they are using the same powder, but they are using a different charge which means a different run.
Most people who understand this, know that these runs are made, tested and sold depending on how they shoot in their test barrels/fixtures.
Again, for PRS22 and NRL22x, you don't need BR level accuracy to win. Its much more forgiving, the targets are bigger and at the higher levels, score is based on shooter ability and skill, not ammo. Guys win matches with Eley Club and SK Standard Plus all the time.
Its Lapua rimfire ammo designed for long range PRS style shooting. The demand for this type of ammo is through the roof.
This is all common sense and logic. Sorry thats hard.