A case of do your homework before not after.
Im a bit surprised to see anyone who uses CAD with any regularity not knowing that a 1050 wont cut it. Just for grins I just seached best gpu for cad and guess how many GTX hits there were? NONE!
My work laptop that renders Cad quite well is a Lenovo P50 with a Quadro M2000M. Its sucks at gaming but rocks for CAD. My G752VY Rocks at gaming but sucks for CAD.
There is no possible way even if you have the tools and skills to just replace the GPU. If you even had to ask that question that should be sufficient reason to not even think it.
Its not like its just something sitting on top of the board with a couple of power connections. The entire graphics solution is built into the motherboard. All the power, Vram, actual chip. Even if you had mad skills to micro solder the actual chip the design of the circuitry is completely different between the Quadro and the GTX and I imagine the number of GPU pins and the actual pin outs are completely different as well. There are some laptops out there where the GPU is a separate card that plugs into a slot, the ROG series isn't one of them.
Not to sound like a parrot but if you need a CAD laptop the advice of returning it to place of purchase sooner rather than later and buying a machine made for CAD is your best bet.
“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein