Difference is that one is front rotor and one is rear rotor. No one makes floating rear rotor simply because it's not needed for piddling amout of braking done by rear brakes. Thus solid rear rotors cost less than floating front ones. Other brands have similar difference in pricing as well, although ones with solid front+rear has more similar pricing.
Galfer = $109 rear + $306 front
Bikemaster = $99 rear + $122 front
EBC Pro-Lite Contour = $149 rear
EBC XC-Series Contour Rotors $ = $223 front
Braking SK2 Directional = $276.95 front
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