Hi,
In this case, you can use the same lock screen as the login screen.
In the Start menu > Settings > Personalization > Lock screen > Show the lock screen background picture on the sign, you can activate it.
Now, there's no direct way to put different photos. What some people do is put it in slideshow mode and put two photos there and activate the lock screen background.
Unlike Windows 10, where it was possible, Windows 11 doesn't allow this.
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Thank you