Keihin FCR vs FCR40 carb. What's the difference?

Hi all. I'm looking into swapping out some parts from my '08 KX450F to a '08 KLX450R. I've had the Zip-Ty racing mods done to my KX450F carb so I'd like to put it on a new KLX450R along with head, cams, and igniton. The KX is listed as having the FCR40 carb and the KLX is listed as having the FCR carb. I'm wondering what the difference is and if they'll swap out without any problems??? I really need to find out so please help. THX!

they are the same carb.

they are the same carb.

Thanks! :applause:

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