It seems like those high 90 percentages have a margin of error when dealing with whites and blacks, because they say 94% on the dark grey, but that looks so much more black than dark grey to me. The picture of it on the keyboard isn't a good representation to me because it is very low light.
you can't f*&#k with math
It's a very approximate representation for sure. First of all I'm checking against an 8bit RGB color space, which is pretty limited. So a distance of 11 is indeed 95% accuracy but if you think of it, 11 over 256 is not a neglectable amount.
In a room environment, with standard artificial light you can't probably tell the difference once the spacebar is mounted on the keyboard. If you make a 1:1 comparison in good sun light it is clear that the PBT one is darker.
In my opinion the spacebars are pretty good already, but if they give me the chance I'll try to make them even better. Like I said a 96% color match would be very nice.