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A K22 needle has a 1.80mm diameter tip. A K8 needle has a 1.50mm tip, .30mm difference.
I.E there is minimal difference in the annulus created by the needle tip/main jet between K22/168 and K8/140.
168/K22 = 138/K8. Both needles have the straight section diameter of 2.50mm
Different needles can have different tip diameters. The needle tip size is part of the equation when calculating annulus created by needle tip and main jet.
Probably better to jet a little rich if track has long straight(s).