Like others have said, depending on weight and environment, a bigger engine means the transmission torque limit will be the constraint in more of the operating region. I expect (hope) Seahawk 2.0 will have a beefier transmission, but bigger engines would help with high/hot ops.
I don't have any data on the new engines, but I'd bet lots of money it's an extra 100 nmi OR extra 45 min on station. Max range is effectively time spent at max range airspeed and trades directly with max endurance time. 100 nmi is close to 45 min at V_range, and either of those is a significant increase (like having a 600-lb internal aux tank situated behind the copilot...RIP Ocean Hawk)
