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The caliper mounting locations on the hub are different so the same caliper can be used on different rotor OD but the same pad radial depth. Most aftermarket custom caliper adapter brackets are designed to move the caliper more outboard so a larger diameter rotor can be used. I’m not sure if anyone makes a caliper bracket that moves the caliper inboard. Also, the rear brake rotor has an integral barrel for the drum parking brake which may/may not be the same diameter for the f8x and f3x.
The oem blue two-piston rear caliper should be identical between the f8x and f3x. Like I said above, a caliper adapter bracket that moves the caliper inward to work with the f3x 330i smaller rotor OD. I’d use realoem.com to verify whether the drum parking brakes have the same barrel/drum and shoe diameters.
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