Creating Texture Packs for Mods

Is it possible to create a texture pack that replaces the textures of an installed mod? I'm trying to replace a texture from calamity infernum, so I downloaded it, unpacked it and found the texture I was looking for (it was in Content/Items/Misc). I created a resource pack, copied a slightly modified texture to the path ResourcePackName/Content/Items/Misc and ResourcePackName/Content/Images/Items/Misc but neither ended up working.

Is this currently supported, and if so, what am I doing wrong?
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