Use the same image for both, or choose two different images.
Here’s what to do:
TapSettings>Wallpaper>Choose a New Wallpaper.
Review the wallpaper options.

Tap the image you want to use as a wallpaper to open a preview screen.
If you selected a photo, adjust or scale it using a finger pinch.
This changes how the image appears as a wallpaper.

If you choose one of the built-in wallpapers, you’re free to’t zoom in or adjust it.
When the photo is how you want it, tapSet.
If you change your mind, tapCancel.
Tap eitherSet Lock Screen,Set Home Screen, orSet Both.
TapCancelif you change your mind.
Live and Dynamic Wallpapers add animation to your Home and Lock screens.
To learn more about these options, find out how to uselive wallpapers on your iPhone.
Search the App Store for wallpaper to find them.
confirm to create an image that’s the right size for your unit.
Check outHow to Customize Your iPhone.