Other programs do not paginate a script the way Final Draft does and when a file is imported into Final Draft, the page count will almost certainly be different. Element margins, top and bottom margins, page breaking, line breaking, line spacing and especially the font -- even if a Courier font is used -- all combine to render a body of text a particular way and each program has its own logic for handling these components.
If you go to Format > Elements (Mac) or Format > Elements Settings (Windows) you can adjust some of the settings that determine how a script is paginated but it might take much trial and error to replicate the original page count (if this is even possible).
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