Does NetFlow Analyzer recognise the same traffic from multiple sources?

Does NetFlow Analyzer recognise the same traffic from multiple sources?

I plan to monitor the WAN interface of every switch in my system, inevitably the same conversations or flows will be seen by two different interfaces, the source and the destination of the traffic.
 
Does NetFlow identify the streams and allow for this, by deducing that packets between the same source and destination IP on the same ports are the same, or will it add it all up and result in double counting for all the traffic?
 
Thanks.

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