I would bet that the 2014 lights and bumper bolt right up.
As far as hood pins, an issue the mustangs have when installing hood pins, is that the aluminum hood starts to corrode at the drilled area. That corrosion creeps under the hood paint and looks horrible. Granted that would happen 3 or 4 years later. But, finding a good clean used ZL1 hood, years later, would be hard to come by since we are very different than the normal camaro and there were a limited number of ZL1's. And a replacement hood from GM will run you somewhere around 1200 bucks.
But, if someone were to use a carbon hood... different story
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Rotofab, grinding rear diff sound forever, dealer replaced supercharger - now i have a rattle when starting from a stop, ordered 2.35 lingenfelter pulley, hp tuner, belt, 100mm idler pulley, tr7IX spark plugs, wideband kit, long tubes with no cats...hoping for 650hp. dyno with rotofab = 518hp