Hey Googleexpert-ga 

Thanks for the answers I am sorry but I pressed the wrong button and
it didnt pay you. Sorry for the hassle.

From what I have read from this link: 
http://isbntools.com/cc.html 
 
It seems like that one digit difference seems to be a Check Digit. 
However, that would make the ISBN Number 9 digits long instead of 10.
Anyway, I strongly suggest you look at the information at the link I
provided.
 
Have I provided a complete answer to your question?
 
YES

Hi jba2905,
Thank you very much for getting back to me.  When I noticed that your
question had expired, I was wondering how to contact you.

If you need anymore help with your project, don't hesitate to ask.

Thanks again.

-googleexpert

Provided a great answer, exactly what I was looking for. Found
excellent sources online.