I`m going to change my sus fork(Rock Shock Recon Silver Tk 100mm 2012) to rigid carbon fork.
But there is one problem- my sus forks axle-crown length is 480mm (my measurement), do i need rigid carbon fork with 480mm axle-crown length too or i can easily put rigid fork with 470mm a/c length?
I read in bikeradar.com forum then if i want use a rigid fork with the same c2a length as a sus fork , usually rigid forks axle-crown length is at least 20mm shorter. IS it true?

P.S. Really sorry for my grammar, English language isnt my strongest side.