This might be a stupid question, but I just ordered a set of cross drilled rotors and the rear rotors have less holes than the front rotors. Is that normal? I know cars like 911's and Ferrari's have drilled rotors, but I remember them looking the same front and rear?

EDIT: The rear rotors have more holes. Typo on my part.

 

I don't know about more holes but my rear rotors have larger holes than the front rotors. I think it's because the fronts get hotter and the smaller holes is to prevent cracks.