Welcome to the site !!
Yea a few of the years interchange , go to this link and Private Message Ken .. he is the owner of this site and he does excellent work at very fair prices ,and can even sell you set up heads , etc. ready to go , he can also tell you exactly what years will interchange and what the different years offer as far as performance gains , etc. , .....
https://www.crfsonly.com/forum/memberli ... f8912810be , A lot of shops just go for your wallet , but I would recommend Ken over most anybody else .... Pro Circuit for example is highly overpriced , Ken has a store here where you can get parts , as well as Service , and he is decent on turn around time and getting your stuff back to you ......
https://www.crfsonly.com/catalog/index.php/cPath/258