Not easily, but the PTS WOC mags aren't that good compared to the GHK offerings anyway. GBBR mags is an area where you really want function over form, and GHK gen 2 green gas mags may look a bit traditional but they perform the best. AFAIK the G5 magazines will also fit the WOC, and those are plastic.
There's the G&P PTS magazine for WA/WOC that gives the more polymer look, but again they just don't perform as well as the GHK ones. Probably the best you can do without buying the old Magpul PTS ones. Or is that the one you're looking at anyway? They just removed the Magpul logo from the old design, which is concealed by the mag well anyway so hey.