Does anyone know why some front rotors are handed left and right? Best I can tell from part numbers NSR rotors are not handed. But for example CBR900RR rotor part numbers are different for left and right hand sides. And does it matter if NSR rotors get swapped from left to right say after removal for a respray?

Thanks.
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MC21R9N track
MC18R2J track
CBR954
CR250