Shimano Centerlock Rotors?

[mtbk66]

Whats the difference in actual performance between a XT( SM-RT77), a LX(SM-RT62), and a Deore(SM-RT63) centerlock rotor? Other than appearance are all these made with the same metal?

[JIM(eration)]

I think it's mostly a weight thing...They all seem like they're made from the same stuff...we have them all in the shop and that's all I can really get out of it...