But unlike say basketball or other sports, there's no one thing that makes you better at engineering. Why spatial reasoning? I did engineering and what spatial reasoning is there? Maybe a few vector calculus courses, and some mechanics. A lot is a bunch of equations. There's also an argument that you can make up for a lack of skill by either spending more time, or for instance by recasting problems from one domain to another. This is what often happens precisely with geometry, you can turn it into algebra.
Anyway I assume you mean that there's a bunch of these types of skills that might be unevenly distributed, and indeed it would make sense to have the numbers.
I'd say one thing to think about is whether there's an economic effect taking place. Suppose women have comparative advantage in something that isn't software. Then even though they might be just as good at it, fewer of them would choose it. And this is where actually absolutes are not what matter, it's the relative opportunity costs that do. So looking at who is better at spatial reasoning might seem sensible, but the decision might be better understood as economic, requiring us to look at Ricardo.