How to distinguish between female hongsloi and cockatoo ?

[anewbie]

I have both hongsloi and cockatoo (different tanks in different rooms) and I was noticing that when the females put on breeding colours (yellow); they are in many ways quite similar. How exactly do you distinguish between the two ?
--
Here are four pictures - 2 of the cockatoo and 2 of the hongsloi:

 

[MacZ]

Hongsloi have a spot in front of the caudal fin, also the head shape is different and the cacatuoides has more pronounced spikes on the dorsal aswell as stripes on the abdomen.

 

[anewbie]

The head shape was less obvious to myself but I did notice the dot. Bit amazed that they are so similar. My cockatoo female is always yellow 24/7 but this is the first time in several months i've seen the hongsloi turn yellow.
-

 

[yukondog]

The lateral line on the Hongs is more zippered shaped compared to the cacatuoides. Are these fish on fry or eggs? They look like there in brooding colors.

 

[MacZ]

The lateral line on the Hongs is more zippered shaped compared to the cacatuoides. Are these fish on fry or eggs? They look like there in brooding colors.

Absolutely right, I was also going to add that, but then again, when in full breeding dress my A. hongsloi has a solud black bar on her sides. I know there's more but the most obvious things have been said now.

 

[anewbie]

The cockatoo is always yellow so I'm not sure what is up with her - she did lay eggs about 8 days ago but snails ate them.
-
The hong is almost never yellow - maybe the second time - but i've not seen eggs - in both pictures they were hunting food as i just fed them.