Yes it does, you'll have to match the timings and voltages, the 4 gb should be paired and 8 GB should be paired., Since your set up came from the Vendor screwed up, your stuck with what you got unless your willing to open the notebook and get rid of the 4 GB under there. I would get rid of it all while you have it open and drop in 2 16GB, leaving your two exposed slots open to upgrade in the future.
The lay out under the Key board is 0 -2, above 1 - 3, bottom ones are paired and upper ones are paired if you load Hwinfo64 you see this.
So I'm not sure how that works out having an 8 and 4 matched up, I suspect that only 4 gb would run dual channel maybe they won't run in dual channel at all since they aren't matched up. I would make sure that 0-2 are exact matches as well as 1-3 are exact matches, all four exact matches should make you error free. But the 2 in dual channel need to be matched up
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro