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Does Google care about cached versions of site having Stylesheet and JavaScript files?

I would like to know if having Stylesheets and JavaScript files available for old, cached versions of a site benefits SEO in any way. Currently I'm adding a hash of the file contents to the file name, so the file that is referenced by a cached version of the site would not longer be available.

Do I need to keep copies of old files around for any amount of time to improve SEO? Or can I just replace the old files with the new ones without any consequences?