I checked on fordparts.com for the hoods for a 2010 F150 and Expedition - both have the same part number.
16612 means "hood" in FordParts'ism. The numbers & letters before (and after) 16612 are the important ones.
2010 F150 hood is 9L3Z-16612-A
2010 Expy hood is 7L1Z-16612-A
2010 Fusion hood is BE5Z-16612-A
2010 Focus hood is 8S4Z-16612-A
2010 Explorer hood is 6L2Z-16612-AA
2010 Shelby hood is AR3Z-16612-AXX
2010 Taurus hood is AG1Z-16612-A
With that, 7L1Z does not always mean "Expedition" in other Ford parts categories. Often it does, but not always. Likewise, our Expeditions are full of 9L3X F150 parts.
I wish a 2010 F150 hood fit a 2010 Expedition, we'd actually have some aftermarket options available.