Men and women have evolved differently because they had to. Men hunted, women gathered. Men protected, women nurtured. As a result, their bodies and brains evolved in completely different ways.
The equality of men and women is a political or moral issue; the essential difference is a scientific one. To develop and improve our relationship with each other; we both should have equal opportunity to pursue a career path in any field we choose and that equally qualified person should receive equal compensation for the same effort.
The difference is not the opposite of equality. Equality means being free to choose to do things we want to do and difference means that as a man or woman, we may not want to do the same things.
We are different because our brain is wired differently. This causes us to perceive the world in different ways and have different values and priorities. Not better or worse, but different.