If there were such a difference, everyone would know about it anyway. Releasing the information wouldn’t matter. For example, everyone knows that men, on average, are stronger than women. Everyone knows that women, on average, are better at non-medically-induced lactation than men.
This better ‘than/worse than’ stuff is crap! It’s all a product of social values, and it can change. It is, in no way, written in stone. It’s just a value judgement. Human values change all the time. It might take a while, but it happens. Just study a little history, and you’ll see.
You ask about whether the knowledge can harm, should you hold it back. There’s no point in holding back knowledge. We have this problem with genetic engineering, or nano-technology. We had that problem with nuclear power. Knowledge and technology can be used for good or for harm.
It’s important to know, however, that the research will be used, whether you try to bottle it up, or not. Therefore, it is far better to release the information and let society respond to it, than to try to hide it, and let self-interested folks get their hands on it, and use it for harm.