Windows 10 Version 1511 pre-dates the shift to SHA-256 signing, so you must verify the SHA-1 hash.
Yes, Windows 10 product keys are version-agnostic for the same edition (Home, Pro, Enterprise). A key that activates 22H2 will also activate 1511, provided you are installing the correct edition. Windows 10 Version 1511 Build 10586 Iso Download
Introduced tab previews and synchronization of favorites across devices. Windows 10 Version 1511 pre-dates the shift to