Why sqllite cannot be accessed across apps though sharedpreferences can be accessed

I have an admin app and a user app. I want to add a value in admin app which can viewed in the user app. I was thinking of using SQLLite or SharedPreferences. This below link tells sharedpreferences can be accessed across apps. Android: Retrieving shared preferences of other application

The below link tells SQLLite cannot be accessed across apps. How to access one App's Database to another Application using Sqlite?

Can someone please help me understand the difference?

Thanks