You won't find any of the OEM needles on a chart. You will find the comparison between the N3Ex/N3Cx needles and diameters in either a ktm manual or a yahama one. The suzuki needles, in a suzuki manual .
What you can carry over between the OEM needles is that the last letter indicates the diameter of the straight section.
The length of the straight section, the taper profile including number of tapers and angles, the clip positions, don't really cross over from one brands needle to another. Also depending on the taper profile some will provide more/less fuel as they approach the needle tip. Obviously this changes the fuelling requirement of the main jet.
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