You mean on EVGA Individual Sleeves two different types or some other cables.
If you think on other cables that's normal, many different types are available, some of them are similar to plastic as you say and other is paracord or some kind of sleeves similar to paracord.
EVGA Europe long time didn't get black cables, USA shop probably have big supplies and Europe nothing.
I wait them to become available and every day almost I check on site...
They promised availability of sleeve cables, not one series.