Android devices run on ARM or x86 processors but use the and a completely different driver stack. iOS is built on Darwin (BSD/Unix-derived) with proprietary drivers designed exclusively for Apple’s A-series chips (A7–A9 during iOS 9 era).

Regarding iOS 9 specifically:

like iOS. They use iPhone-style icons, control centers, and wallpapers, but they still run Android apps. Theming Zip Files

Installing a native, "signed" version of iOS on an Android device is not possible

. While you may find files online claiming to be "iOS 9 signed ZIPs for Android," these are typically skin-only mods