Genuine will be ART brand which are cast & good qual. Wiseco have brought their game up from the old days (esp on late MX stuff) & with plated barrels this is what the majority of aftermarket tuners will use.
Don't lose any sleep over it & get what is going. Be more concerned with the powervalves. Strip them out , clean them up without harsh scratching (oven cleaner helps) & inspect very carefully. Not sure on KX but powervalve actuator could be Left hand thread nut. Don't be surprised if ex flange o-rings need replacement. Will be silicone for higher temp.
All pretty easy stuff though.
Don't you look at my accountant.
He's the only one I've got.
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