BB Diameter vs. Inner Barrel Diameter

Let's assume ideal conditions (perfect polish and roundness, exactly the same BB weight, same energy output, same inner barrel lengths, etc):

If a BB diameter is 5.99mm and you're using a 6.04 ID barrel, the difference in size is 0.05mm.

If a BB diameter is 5.95mm and you're using a 6.00 ID barrel, the difference in size is also 0.05mm.

Would the performance be the same? => FPS and accuracy to be specific.