How can one determine the difference between HRC main jets and Keihin main jets?? I've got both HRC and Keihin brand new and in packets and they have identical markings on them..

HRC slow jets ARE longer than Keihin??

HRC needles have smaller letters stamped on them as opposed to Keihin and the letters are slightly closer to the adjustable slots at the top of the needle than the Keihin needles??

HRC needle holders have a brass ring pressed into the top??

Cause at this stage after comparing what I just purchased, which I was told ARE HRC items.. They are different to the HRC items I already had which are still in sealed bags..
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MC18 Race bike project..
MC21 Race bike..