@elemenoP - you can, it just isn't the default for the plugin. If you go into the plugin options there are three choices of page count algorithms. The default one when you install is "Paragraphs (APNX Accurate)", the second option is "E-book Viewer (calibre)" and the third is "Adobe Digital Editions (ADE)". So if you choose that third option you will get the same ADE calculation which should in theory be the same as your device? I used to believe that the calibre e-book viewer used the ADE calculation, however I have only just realised that is not the case and hence there are now three options in this plugin as of v1.4.3, rather than the historical two.
The reason why the "Paragraphs (APNX Accurate)" option is the default one is because I am biased towards Kindle owners being one myself.
As Kindles don't use the ADE page count, users tend to want something that is more realistic towards the actual # of pages in a book, which is what the "Paragraphs" based algorithm attempts to do. The ADE page count gives you very large numbers which bear no relation to the real world paperback page counts. However the ADE calculation does have the benefit of being consistent across books and is supported by some readers such as you obviously have.
Any other questions about the Count Pages plugin just ask on
this thread, I didn't intend to derail things here.