Too many variables....... and no barrel or batch of barrels can be identical even if the same length and choke.
Different guns deliver air in different ways as well so it will differ how one gun will push the pellet out. Some regs or valves will give a smaller volume quicker and with a higher pressure burst, where others will give a lower pressure, bigger volume push that builds gradually.
A longer barrel uses air differently because it needs less air as the pellet stays in the barrel longer, allowing air to build up behind it and gain speed. That's why longer barrels use less air.
What you can generally say, is that most modern similar guns with the same type of barrel usually like similar batches of pellets. How vague is that?
Wow what was the question again?: