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YES, LC9/LC9S/EC9S magazines are interchangeable. I hope this helps

From the Ruger forums "Mags are the same. Other than the serrations and finish" https://www.rugerforum.net/threads/need-advice-lc9s-compatibilty-with-ec9.380673/

Kevin, they are actually the exact same magazine used in these models Sir. Cheers and stay safe!