how to identify the duplicate streams in RTC

 you can compare Stream A with Steam B and see the change set results

Duplicating a stream is not any different from creating a new stream except that the operation automatically adds components and sets flow target. The operation does not maintain historical data that could link the new stream to the old one. You can possibly compare streams to find out similar streams. You could also adapt some sort of naming convention for your streams so that all related streams have similar names.