convert from wr to yz gears

I have a 2001 wr426f and switched out the two tranny shafts and gears from a 2002 yz 426. do i need to switch out the cam shifter and shift forks to? Are they compatible? The bike wont shift right with just swaping out the two tranny shafts. Misses inbetween gears and wont hardly downshift. Shifting is all weird and unstable. My question is will the 2002 yz tranny work with

2001 wr shift cam and forks? SOMEONE PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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