Some of the reproduction cables are really close. As you can see by the pic provided originals cables have a lot of details! Two different reds on the cables, green secondary wire, tag near the starter lugs, etc.
A dead give away to an original cable is the larger primary wire is a flat red color and softer insulating material than reproductions, which are shiny and hard.
On the negative reproduction cables the black insulation is a fraction thicker than originals which are around .255” overall. There is no negative cabling available that matches the originals due to dot regulations.
The only reason I know that is because I worked with the company that produces the nicest cables out there and provided them all the nos/ production samples.