It is not a good practice to do so.
If each app uses the same source code but different ressources, you should offer customization options within the main app.
You won’t have good dev feedbacks by polluting the market this way.
With customizations, you can reach as much users as you would with a 1000 apps, because you could meet their needs properly.
Take a look at Inn-Apps billing in the official Android developer documentation…
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solved Multiple android apps [closed]