There is more difference than just the powerplant. The Trail XL is a bigger, longer and heavier gun that takes a lot more effort to cock.The Trail XL will shoot a 14.3 grain pellet around 900 FPS while the Trail NP will shoot the same pellet around 780 FPS.Airgun manufacturers claim pellet speeds using light weight non-lead pellets and is an advertising gimmick. That's why none can match the advertised speed on the box using lead pellets.