Will this work with the LGA 115x version?

It should, the NH-L9i is the LGA 115x version and it says right in the title that that is what it's for. I used the NH-L9a myself and it worked fine. If you want it straight from the horses mouth: https://noctua.at/en/nh-l9i Under accessories it lists this too.

Questions & Answers: Noctua NM-AM4-L9aL9i, Mounting Kit for Noctua NH-L9a & NH-L9i on AMD AM4 platforms

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Noctua NM-AM4-L9aL9i, Mounting Kit for Noctua NH-L9a & NH-L9i on AMD AM4 platforms

Dedicated solution for Noctua NH-L9a & NH-L9i (see Noctua.at for details)
Trusted SecuFirm2 quality
Tailor-made for AM4 (Ryzen) in order to ensure optimal compatibility
Outstanding reliability, optimal contact pressure and easy, straightforward installation

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