These are two different statements about two different kinds of page numbers:
Quote:
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Contains real page numbers based on the print edition (ISBN 0802121403).
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The first indicates the length of the book by using an algorithm to determine that the amount of content it contains is approximately equivalent to that number of printed pages. It is there to give you an idea of how long this book is relative to other Kindle books.
The second indicates that the start position of each page in the print edition is marked within the metadata of the Kindle book. This allows the Kindle book to show which page number you are on as you read and enables the "Go to page #" function.