Actually, I can hear quite a big difference between them.
I used atomica high almost exlusively last 2 years but a few months ago, I discovered the CCV and daaaaamn....
the feel of ccv is unreal, spongy and elastic but also supertight and chewy at the same time with aggresive kerrang and cleans up amazingly, almost like a dumble models... my all time favourite model in axe /,,/
Edit : the biggest difference is liveliness of ccv, compared to atomica.
I am sure the bright switch in ccv models helps a lot with that.