If two human babies...

He meant drinkable water!
Holy shit, American education is truly a meme.

Their roles would correspond very strictly to their biology and environment, having no social development except that which they create in their life. So, moreorless yes. It would be different because there's only two though, they can't optimise into their roles without having a robust society as it's a matter of survival. The main difference between men and women is men's agency and decisiveness. Men are more aggressive and violent because they are more decisive and driven, and they have the strength and intelligence to back it.

Both would die of dehydration.

Why rape? What if she wants it too?

They are babies, they literally cannot do anything on their own whether they are male or female

Would depend on the psychologies of the children if they even lived and even if they did live, they would have psychological trauma.