'no less' VS 'not less'

[Unregistered]

1 Could you explain the difference between A and B?
A: She is not more beautiful than you
B: She is no more beautiful than you.

2 Could you explain the difference between A and B?
A: My drawing is no less beautiful than yours.
B: My drawing is not less beautiful than yours.

Thanks in advance.

[Soup]

Sam: She is more beautiful than me.
Pat: No, she isn't!
Sam: Yes, she is.
Pat: No, she's not (more beautiful than you are).

=> Meaning, she not as beautiful as I am.

Pat: She is no more beautiful than you.

=> Meaning, she is just as beautiful as you.