The P-01 has the accessory rail, the PCR doesn't have it.
The P-01 has the standard CZ sights, the PCR has "Novak-ey" type low-mount sights.
The P-01 has scalloped rear cocking serrations and a counterbored hole for the takedown pin, the PCR doesn't have those features.
The P-01 doesn't have a chamber loaded indicator, the PCR has a "chamber loaded" signal pin in the top of the slide
The full-sized CZ-75 magazines work in both the PCR and the P-01, although they stick out of the magwell about 1/2".