Unity always creates its own internal copy of the particular file, which might be much smaller than the original file (eg. with PSD files). But this highly depends on the file type you are using. You can see the actual imported file size when selecting the Asset in your Project hierachy and looking at the Asset preview at the bottom right.
Unity Store assets often contain examples (eg. Scene to show how to use it) which won't be part of the final build, especially with code-only assets (like the 3rd person controller you're talking about).
I would say the best idea is to just export the project as an APK file and check its file size eventually.
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