Can you change gears from a yz to wr?

I have a 99 yz 400 that i bought new but i find my riding style has changed over the years. I would like to by a new wr but would like to regear mine if possible. If i cant , will a 99 wr 400 motor fit on my yz and would it be worth the aggravation? (when i say regear i mean transmission not sprocets) Thanks for any help

yea, but its gonna cost alot

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