The last time I looked, it APPEARED that the VDH plate was identical to this one (which is $69.95 and purported to be in stock):
Blue Reef Stainless Steel Back Plate
Blue Reef Stainless Steel Back Plate
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The grommet holes most likely won't line up.
I have a Dive Rite backplate that is the same as a DGX. From the top grommet hole to the slotted hole at the bottom it is 10 1/2" to 11 1/2". The VDH website says the grommet holes on the wing are 9" and 12". VDH gives the option of ordering a Hog backplate with their backplate/wing package, so I assume their plates will line up.
HOG Stainless Steel Backplate - BCD - Products