Making the pdf exactly match the original page numbering would be more complicated than making the number of pages closer to the original. To make a pdf closer to the original try converting with different base font sizes in the Look and Feel tab. Adjusting the page size of the pdf will also affect pagination. These adjustments would get the pdf closer to the number of original pages. The program used to create the pdf would also affect the number of pages. If this technique doesn't produce a desired pdf then forcing a new page in the pdf when the epub says the original page has turned might be possible except that is beyond my experience.