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I bought my old Android phone on a trip to China so some apps came from Chinese app stores and some came from Google's after I came back.

For apps that fit in a certain category, such as currency converters, how can I identify with certainty which exact such app is on a phone. By looking around the app and in the phone's preferences and settings, I can only find the name, which is pretty generic, and a version number.

Is there some kind of more unique identifier, some kind of ID, or some kind of link that's somewhere on all Android phones that will truly identify each app?

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