happens often, the plates of my 83' GPZ750 are shared with the 2010 ZX12.
all what it means is that the friction plates are the same so you can use also use performance plates from modern models on older ones.
The plates
count is going to be different, so not sure what you mean by using the "clutch of a crf450", the baskets for instance? not likely
BTW using those cross references i found a cheap Barnett plate kit that was advertised for a different model....