If you can plug in your USB-C cable, yes... if it has an attached micro-USB cable, then you'll need an microUSB-to-USB-C adapter (one comes in the box).
I went ahead and purchased new cabling. I am bound to lose the adapter in the car. It will be easy to switch cables so that my wife can charge her GS6. I will use the adapter for my current Samsung AC fast charger until the micro USB cable wears out. I also to change out the cable at work. Too impatient to order the adapter so I went to best buy.