WordPress should handle the 301 redirects for you automatically in this case. It doesn’t always, but it should here.
Long story short, WordPress has a function, redirect_guess_404_permalink which tries to find the correct post when it encounters a 404 by using the end of the 404 url to query against the wp_posts.post_name. If it finds a post, it will perform a 301 redirect. In your particular case, because your old structure ends in %postname%, this should very reliably 301 all your old paths.
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