I have received the R2 blue now, and I have accepted it. We can now start production, finally!
Colors are not completely 1:1 perfect, but they are good, especially considering the starting point of having to start from scratch after the GB. The blue is now ever so slightly too light, but there is no closer blue in the RAL Design catalogue.
This option is better than R1 blue base, that was good in bright sunlight, but looks black in indoors lighting. Rather slightly too bright than way too dark, and it is still close. (See GMK Phantom as an example of this)
Because of the circumstances, I will offer to buy every unopened kit for the GB pricing if you decide it is not the GMK Firefly you bought into.
To me, the colors look like GMK Firefly even if the shades of color might be a tiny bit off (this is also why we have renders in different lighting conditions), it is still good and no color is too pale/too saturated or anything like what we have been seing from other sets.
If you doubt this, please wait for images to start to surface from me and others before opening your kit, and if you are unhappy with the results, I will buy every kit personally so that you can get your money back without the hassle of mechmarket.
I think the differences are not noticable and you will still feel like you will get the set you bought into, but the least I can do is offer this buyout due to my inexperience that caused this situation where we had to find all new RALs.
This same mistake was not made for GMK Rouge.