Returned PSU is different

I went to return my cosair TX650 v2 because of it being loud ( less than a year old) however after a few weeks when i went to pick it up they gave me a brand new one but it was TX650. I am just wondering if there is any difference they both have the same efficency , watts and connectors from the outside of the box should i go return it for my TX650 v2 or just keep it.

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