Not all printed or electronic Hebrew Bibles ( Mikra / Tanakh) are exactly the same in all details. For example the diacritical symbols used for vowels ( nekuddot) and cantillations marks (ta`amei ha-mikra) can sometimes vary from edition to edition. A good illustration of this is to be found in Genesis 32:18 see the picture below:
It should be noted that in the above example there is a slight change in vocalization and in maybe how the text is to be chanted but not in meaning. An interesting discussion on of this can be found in the archives of the Avodah Mailing List: http://www.aishdas.org/avodah/vol08/v08n090.shtml#03
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