There may be differences in theSystem suitcase rather than in the Finder for OS which comes with your hardware but I think the finder of a fresh x.y install is always the same than the Finder installed if you do an update to x.y.
And OS X does change some other things in the classic system folder, not the Finder.
My 8.6 Finder says it's version 8.6, my 9.1 Finder is version 9.1.
-