What is the main difference between the conducting portion of the respiratory system and the respiratory portion of the respiratory system?

In the respiratory system, the main difference between the conducting portion of the respiratory system is its parts and function. The former contains air-transmitting passages (with respiratory system acting as a filter) as well as special portions functioning for smell, phonation and alimentation. The latter however, is a location where actual gas exchange occurs which of course contains different parts than the conduction portion.