How to migrate Nintex workflow SharePoint 2010 to 2013 using content matrix

I am trying to migrate the Nintex workflow from 2010 to 2013 so I click on Attach external Connection -> Add Nintex Database -> Then Nintex Database picker. Here I am a little confused about which database I need to add for migration SP2010 existing Nintex database or I need to create a new Nintex database in SP2013 and attach that. Please help me I am not so familiar with this step.

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