The body panels are all the same that they would mount to from 2009 to present 1500s and 2010 to present HDs, but in 2016 they added a bracket to get the trucks to do better on the then brand new small overlap crash test that came out after the truck was designed. Ford made a big deal out of how their aluminum truck did better in the test than everyone's steel truck, which was really just because their truck was designed after that test came about and nobody else's was.
Anyway, that bracket can interfere with mounting certain steps to the rocker panels and can require grinding if you don't get specific 2016+ steps