Doing some more fiddling with the paintjobs, I believe I have come up with a solution:
First, I did some testing to compare the "Basic" red to the default PCGamer main body red:
Default PC Gamer colors (no changes):
Replacing the secondary "gray" stripe with "Basic Red":
You may see that you can see a difference in the colors: The "Basic Red" looks slightly darker and duller than the default PC Gamer red of the main body. However, I believe this is because the zone for the secondary color channel is already muting the color a bit. When changing the main body color to "Basic Red", you'd expect it to match the secondary stripe, but instead we get this:
While we can see that the main body is slightly different, the secondary band that is supposed to be the same color, is still darker than the main body.
Let's compare this "Basic Red" color (that has already been compared to the default PC Gamer colors) to "Phranken Red":
And here we see a very similar, although almost a more vibrant color than the "Basic Red"!
SOLUTION:
Switch "PC Gamer Red" with "Phranken Red"! This makes more sense in a couple ways: PC Gamer gets the more vibrant red that's closer to the color that PC Gamer actually uses in its logo, and the Phranken color set gets a darker "blood red" color that's more appropriate to its "Monster" theme!
Secondary issue:
Switching the secondary color to "Gray" shows that this premium color is indistinguishable from the color that was already being used in the PC Gamer skin. If this wasn't an issue, why is there such an issue with the Red colors?!? But there is an even bigger question:
What's this gray color doing in the PC Gamer set in the first place? PC Gamer doesn't use gray in it's logo, it uses white. I would've said something before, but we didn't really even have a choice before. Here, I've swapped the secondary color to white:
Now, I suppose we can't have different names (let alone prices) for the exact same color, they have to be unique and special. I would then suggest to change "PC Gamer Gray" with a color somewhere between "White" and "Light Urban Gray" (although closer to white), and then we have a better, PC Gamer color set that is closer to the colors PC Gamer actually uses.