The yellow one is probably recessive yellow, as well as the darker brownish looking one; the rest are all variations on the black/blue pigment. This means that your two carry recessive yellow, and have presented you with a very nearly perfect representation of the percentage showing the recessive yellow. Those yellow babies will most likely lighten in hue as they age. The sooty yellow should become a lovely deep golden bronze by the age of three or four months.
It's possible that the darker brownish one is chocolate, which is also recessive, but a very light version. Time will tell.
It's possible that the darker brownish one is chocolate, which is also recessive, but a very light version. Time will tell.