That is correct. the OEM 93 cobra taillight is actually an 85-86 SVO which were charcoal grey in color. the 1984 SVO taillight was black. I did see a side-by-side of both and it's a noticable difference.
Given most of us here don't actually have 93 cobras, not critical to be authentic IMHO. For instance, i knew the cobra lights had one bar stop short due to the reflector on the side and not wanting to block it. I thought this looked a little silly so I installed my pinstripe to continue all the way around. i also painted mine black. Not authentic, but not what i was going after here.
Also, the repop taillights being sold today are the 83-86 taillights with vinyl pinstripes applied. the OEM's were painted. DCR has the original tooling, so the lens itself is made to Ford specs, but from what i remember, the paint striper broke and Ford never repaired it. So the stripes are 1/8" vinyl that are applied an in additional process.