I bought my 15 Silverado brand new and shortly after gm announced the 2016 Silverado. It was too soon to trade in for the 2016 Silverado, so I decide to change the front end.
For fog lights and parking sensors the difference is the fog light connector, you need 2 Molex MX150 connectors.For headlights the connectors. you can find the harness on ebay