How to Merge 2 Published Apps on Google Play Store? [Solved]

The signatures of the two apps' packages are univocal. And updates are biunivocally associated to their respective package. 

Even Spotify had the same problem, months ago. Do you know what they did? They updated one of the two apps, displaying a message which said "go away, you can't use this app anymore: download this one instead". In this way, they make the old app's users flow into the new one, by all means merging the two. 
 

Note:- This Article on How to merge 2 published apps on Google Play Store is Only Meant to Provide Information.