Assuming that everything else is the same (ice is same temperature in both cases, not considering the effects of the surrounding area, the thermal properties of the bowl, etc.), they would cool it the same amount, though the shaved pieces would melt faster, cooling it faster. However, the soup would likely be cooler after the ice cube melted, than the soup after the shaved pieces melted, because more time would pass by then, so the soup would lose more heat to the surrounding area, to the air and through the bowl over that greater period of time. But that is including the effects of heat radiating into and out of the bowl and directly into the air over that greater period of time, and is not just a change in temperature from the ice cube.