Can hazelnut flour be swapped for almond flour without being a disaster?

I've not used almond flour previously. Hazelnut is the King of Nuts in my opinion.

The recipe is Palisade upside down peach cake. I agree with the hazelnut raspberry combination.😉

Both nut flowers make a heavy crust. But yes they should be able to be used interchangeably. I sometimes use hazelnut flower when I make a Linzer Torte, and sometimes Almond, and sometimes I mix them. Hazelnut flour to me is a bit sweeter than almond. With peaches I use almond, and raspberry jam hazelnut :))

In many things, sure. What is the recipe?