Um, I think you see it backwards... the old Norse/Viking culture is at the roots of both games so of course there are similarities. I don't find the use of resources in the environment very specific of either games also, and I think it would be weird to call in-game Rations as potions or elixirs because, well, they're literally food rations (you make them with food and drinks).Lmao I also noticed this. I'm playing Assassin's Creed Valhalla right now and noticing the similarities besides the Norse mythology & culture inspo.
Like how the game also uses Rations and Fine Cloth. Also with the use of mushrooms as resources in the environment. I think these are too specific to not be inspired by AC Valhalla. Any other game would use 'Elixir' or 'Potion' instead of 'Ration'.
If there are inspirations, they're very diluted I think.