The page number you're looking at is calculated dynamically by the reader in both ePub and KePub modes. It's different because of different settings for each type, but if you tweak the KePub settings you can get the ePub number, or you can tweak ePub to get the KePub number. What the "Adobe page numbers" setting gives you is those faint numbers, which is always a static calculation based on the number of characters of text (I think it's 1024 characters per page). The Kobo readers don't give you a way to go to a location based on those numbers though, not sure if any reader does.
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