What's the difference between (a = = 0 & & B = = 0) and a! = 0 & & B! = 0 RT

What's the difference between (a = = 0 & & B = = 0) and a! = 0 & & B! = 0 RT

On the left, if a is 0 and B is 0, then at least one of a or B is not 0
On the right, a is not zero and B is not zero, that is, a and B are not zero