"no more than", "not less than", "no less than", and "not less than".

"When we use 'no less than ...', we add a little attitude to what we are saying."
englishforums.com

I am not sure if the above forum is authoritative, but you would notice the differences between " no more than", "not more than", " no less than", and "not less than". They are not interchangeable.

However, I don't know if native speakers of English do differentiate between "not more than something" and "no more than something". I read somewhere that they now tend to think that the two expressions are the same.