Well they are pretty close, close enough with the variable nature of the black on A. percula.
The defination most use for the onyx variant of A. percula... That all three bars are connected with black. So the female in the picture doesn't quite cut it with the gap in the black between the tail and mid bar.
But it may well fill in over time.
I had a male onyx that lost his mate in QT and was paired with one of my juveniles and he soon grew into she and most of the black between the tail and mid bars faded. Now that she is nearing her full size and is not growing like a weed, the black is starting to fill in again.