yzf 426 engine in 450 frame

I bought my first thumper recently which i thought was a 450 since its in a '04 frame but on the cylinder it says 426, my question is do the 426 engines fit straight into a 450 frame or were there some models made in that year with 426 engines fitted 

i think the 426 cilinder will bot up to the 450 engine, i may be wrong

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