As I understand it, the Kindle "true" numbers that you are talking about reflect the actual pages in a particular edition of the paper version of the book.
Kobo, Nook, Sony, Adobe Digital Editions are using "artificial" pages calculated on a certain number of characters equaling one "page" (# of pages is independent of font size, margins etc) OR (at least in the case of Kobo's own book format) the number of "screens" of text at the current font size/margin/line spacing settings (so if you increase the font size the total number of pages will go up). Since it sounds like you just want the relative position in the book for your own information any of these should work (if you're trying to share a specific page with someone else it gets more complicated).
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