The 777-300ER (77W) has a higher MTOW than the 777-200LR (77L) based on Boeing's info. The thrust for the engines on the 77L is the same or slightly lower than the 77W depending on the engine variant. But I believe the 77L has a better power to weight ratio. Finally, the wingspan of the 77L and 77W are equivalent. Sources: http://www.boeing.com/boeing/commercial/777family/pf/pf_exterior_lr.page http://www.boeing.com/boeing/commercial/777family/pf/pf_lrproduct.page?