N. chromatus and N. coloratovillosus differences?

[TalonAWD]

I am doing a trade with the N, chromatus (The one I feel I want) and after looking at various pictures, I noticed that they look almost the same. I sometimes see that the N. chromatus has a red Abdomen (Which is what I want)
Both tarantulas young look the same or almost identical. So I want to know what is the main difference between the two and how do I know that the one I am receiving is the right one since they look the same.
Help me out.

 

[tarsier]

The N. chromatus is smaller, has a more vibrant red to its abdomen and has more distinct black and white markings on the legs.

The N. colloratovillosum is larger, has the same general color scheme but less distinct (if thats the right way of putting it).