Yes and no. The “.import” files are the files Godot will use instead of the source files (like .png, .dae, .obj, etc). The .import files are more optimized for loading in Godot. What I would recommend doing is adjusting the import options to see if that helps reduce the size.
(I think the assets in the .import folder in the root folder of the Godot project are the actual import files used, while the .import files by the assets are just links and import settings, but I am not 100 sure, so please take it with a grain of salt 😅 )