BBs tend to change color quite a bit. I have some I got from one supplier and a few higher grades too. My females go very pale then get much bluer after they are berried for some reason. Lately all my BBs were pale powder blue in my co2 planted tank. Now today they are much darker blue more turquoise in color and nothing in the tank has been/or changed.
I think it has a lot to do with mood...stressed out they go pale, happy they get darker....females molt go pale, berried they get darker....who knows...shrimp are fascinating at any shade.
If you get them to breed that will be the clincher. I have heard from sources that to get the optimum blue color, you should use 1 high grade x lower grade, as high grade x high grade doesn't always equate to deeper blue color.
Good luck and keep us posted.
I have a BB berried now too, but it could be anyone BB, BKK, WR, CWB or Snow white, as all are in my TB tank.