While it is true that HB205 and PC200 have the exact same width, length, and height, little brother HB205 performs more efficiently! It is equipped with a hybrid system that was uniquely developed by Komatsu. It requires less fuel and emits less carbon dioxide and nitrogen oxide. Their weights are different because the HB250 is loaded with the hybrid system that includes an inverter, a capacitor, an electrical generating motor, etc.