They only difference I've seen in the 1500 is the Silverado has a slightly different grille and headlights with LED daytime running lights. I haven't noticed any difference in the GMC 1500 since 2014 when they came out, but I don't keep up much with half ton stuff. I don't remember seeing pics of a Silverado in that article either, so maybe it did get the same updates as the 1500 version. I don't really know.
The 2016 has a new infotainment system with Apple CarPlay support, and wireless charging.
I think lane keep assist and a couple other things as well.
The base model headlights are now HID's...yes, even work trucks have HID's. Top level trucks have LED headlights.
And finally, the 2016+ cab structure was strengthened around the door sill and A-pillar to improve small-overlap frontal crash performance...
Ben