Five in the morning or Mantecados and Polvorones

I often wake up around 5 am. Anyone of a certain age will know why. Usually, I find that I don't go back to sleep properly; I doze, and I turn things over in my mind. Typically, the things are of no importance - I remember a job to do, I wonder why my knee is aching, things like that. This morning it was mantecados and polvorones. Mantecados and polvorones are typical Spanish Christmas biscuit-like cakes. They're supposed to taste different to each other, though I can never remember which is which. A website I just consulted tells me that polvorones tend to crumble more than mantecados and that polvorones have ground almonds in them, while mantecados (which get their name from their high content of manteca or lard) don't. The website says the shapes are different too and then goes on to say that both can be round (!) but that polvorones are square and mantecados are rectangular. On other websites I've read that mantecados have various flavourings while polvorones don...