These are slides meant for the press/media briefing. The "back up" is presentation slides which AMD don't have time/won't talk show during the phone brief which is usually 40-50 minutes + Q&A - but will be available in the same PDF
It's generally more detailed in terms of the technical stuff and some extra slides and information. It's also there you can read about all disclaimers, exact system information used for each test etc.
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