Realize that comparing planets is hard, but is Earth really that unique?
More to the point, if everything say 20-km below sea-level up into the exosphere disappeared (and the moon too) - what would be left to differentiate Earth from other planets?
Most notably, a moving Lithosphere. Shaving off the surface 20km (Lithosphere is~120km) would not stop plate tectonics. What makes Earth's surface so different is that it has a constant cycling of lithosphere; Dead planets are forced to keep surface scars caused by major impacts and weathering. To this date, we have not found another example of plate tectonics, though our ability to confirm this on other planetary bodies is limited.