Boeing 737Max and Airbus 320neo use the same 4th generation GE CFM-LEAF1A,B engine which have 180-194 seats & operation configuration 6500 km. C919 uses 3rd generation CFM-LEAF1C engine with 158-168 seats and 4630 km operation configuration. C919 has less fuel capacity and less efficiency (26.8-30.7%), it carries 6,000 liters less fuel which significantly hampers its flying time.