What differences are due to biology is a fascinating question, but since differences between individuals are far greater than differences between the genders, there's not much practical use in considering the gender differences*.
If you think about it, it is a curious thing to say that "differences between individuals are far greater than differences between the genders".
On the one hand - it seems intuitively true. People are so diverse in so many ways. Because of their individuality, not because of their gender. Which makes sense - I mean there are also only two genders, but countless individuals.
So individual factors have naturally a way bigger impact on our uniqueness / our diversity than something so entirely non-unique as gender.
But is this the same as saying that "differences between individuals are far greater than differences between the genders"???
How do you compare those differences?
It is easy to compare two individuals. You lust look at them and will notice differences.
But how do you compare genders? Supposedly, by somehow calculating a fictional person representing the average of its gender in all areas.
So we have proto-male and proto-female and compare the two. If we now compare the difference between the two to the average difference between two random individuals, the one between two random individuals is supposed to be a lot bigger. And that seems like a very safe assumption.
However, that will tell us little about the importance of gender. Because the comparison is fundamentally flawed. Whereas with gender we use proto-types to come up with a difference, with individuals we use real people. And doing so is the assumption that individual factors would not interact with our gender. It makes the assumption that the influence of gender was some kind of static constant while independent of this constant you got the individual factors.
The reality however is that our gender is throughly involved in our individuality, it is a big factor shaping our individuality. And how big can not be determined by such a simple comparison of statistical differences.