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Look like different size rotors.
From Chevrolet Press releases:
2015 Z/28
Rotor diameter x thickness, front (in / mm):
15.5 x 1.4 / 394 x 36
Rotor diameter x thickness, rear (in / mm):
15.3 x 1.3 / 390 x 32
2017 ZL1
Brake Rotor Size (in / mm): Front: 15.35 / 390 vented, with six-piston monobloc calipers
Rear: 14.4 / 365 vented, with four-piston fixed calipers
And what about rears? Iron up front and carbon in the rear?
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