I think the Nordic countries' Aquavit is more like Malort than the Italian Amaros are.
Fun fact: The Nordics are so cold, to age their Aquavit in casks, some producers would load them up on ships and send them to the equator and back. Linie Aquavit still does this tradition.
Personally, Italian Amaros are much better than Aquavit or Malort though. Forget Fernet when there's Averna.
I don't think Aquavit is very similar to Malort at all. They lack the bitterness and extreme astringency. Aquavit is more like gin but with a different botanical lineup.