if you look at both of the books - you will find that one has been heavily edited by dishonest persons,
this is despite the fact that there are many respectful texts remaining in the previous scriptures with sayings from the prophet's (may God's peace be upon them).

the fact that the genealogy provided in genesis shows Abraham (pbuh) to have been alive at the time of Noah (pbuh) shows that there are big edits here:

it shows in the edited previous scripture that Noah (pbuh) died 2006 years after the creation of Adam (pbuh)
and that Abraham (pbuh) was born 1948 years after the creation of Adam (pbuh)

this would imply that Abraham (pbuh) was 58 years of age when Noah (pbuh) died
we know that this is not sensible as Abraham came and found his people deeply entrenched in idolatry for generations - Including the tyrant king Nimrod.
- this would not be likely while the generation those carried in the Ark were still alive and the last remnant of idolaters had been destroyed.

i have provided a chart  - don't know if it's visible so i will also add links - you may have to remove spaces,


http://i248.photobucket.com/albums/gg195/abz2000123/AbrahamsGenealogy.jpg

http://i248.photobucket.com/albums/gg195/abz2000123/AbrahamsGenealogy-2.jpg





peace