Duration: The duration of The item (movie, audio recording, event, etc.) in ISO 8601 date format.
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There's generally said that there are two formats for recording time - simple and advanced (with colons) and they are built on the following principle:
- hh:mm (hhmm)
- hh:mm:ss (hhmmss)
- hh:mm:ss.sss (hhmmss.sss)
In other words, the recording starts always with hours and as needed added minutes, seconds and milliseconds. What is easy to conclude that in your case both options point to one and the same time.