This is what i also thought initially, but they are indeed the same item.
It took me a minute of looking, before i was certain why they initially look so different.
TLDR:
It really is just a quite unfortunate combination of light, angles and shadows/reflections that causes the differences in color and makes our pattern recognition see long lines that create an additional structure above the eyes).
That being said, cosmetic items should be presented in mostly neutral light that does not distort the look of the cosmetic. The player should also be able to spin the character model in order to see the model while illuminated from different angles.
It is also a good idea to add the option to switch between different backgrounds with different lighting, that represent the cosmetic‘s look in some of the light settings that are encountered during missions.
In the set-preview, it does look like the mask is black, with a red, headband-like horizontal structure right above the eyes.
This structure is missing in the close up preview of the headpiece, which has neutral lighting and shows the entire headpiece in a red color.
But if you look closely, you can see that it is not actually a structure at all.
What initially looks like the outlines of a different structure with a different color, is actually just a combination of lighting and shadows, causing our mind to trick us.
Shadows/reflections from the spikes, which line up almost perfectly with the brows (especially on the left side in the image) create the outline of the “structure” that appears on the forehead.
With the markings in the image, you will already notice that you no longer see the structure, because your pattern recognition no longer connects the shadows and the brows (or the shadows and line of contrast at the upper forehead) to a single long line.
Different appearance of colors due to lighting (elevated green light source behind the character and neutral light source on the right side of the image) add to the confusion.
The top and sides of the mask are illuminated by green light that distorts the colors.
The lower forehead and cheek on right image side are illuminated by a different and more neutral light source, but the green light does not reach them, so they look red as they should.
The visible part of the nose and the cheek bone on image left side, lie in the shadow and barely get any light at all, so they appear to be dark grey.
When looking at the original image, both cheeks seem to appear black, but this is an other case of our minds tricking us, because we expect symmetry.
When separating the different sections with white borders, you can clearly see that the illuminated cheek is not black, but red.