peanut said:shimano are a standard spline pattern throughout the range from 8 speed to 10 speed hubs and cassettes Jimbo.
The only spline that isn't backwardly compatable is the Dura Ace alloy one and the OP doesn't have one.
You are probably thinking of that other Gruppo that isn't backwardly compatable ...starts with C
That's OK Peanut.
It's idiot questions followed by concise answers that makes the whole learning experience for newbies so enjoyable.