If the textbook's ISBN is different should I buy it?

I'm looking for my calculus textbook (below)


ACP CALCULUS 9E WITH APPENDICES


by LARSON


ITP 9th Edition 2009


ISBN: 9781424068487





On Amazon there is a textbook with the same title and author, but a different ISBN (9780547167022). Would the contents be different?|||The one you need is a custom edition for your college. You can ask your teacher if you NEED that edition or if a normal one will work.|||Yes, very probably.





The ISBN number refers to a specific version of a book.





If the teacher wants you to have the ISBN number you indicated, then that's the only book (with that number) you should buy for the class.





Since it's the 9th edition, it probably contains information updates that are not in earlier editions with the same title.|||type the number in at google and see if the same book pops up after you click search, that's how you will know if it's the same exact book you need or not.|||I believe it's the same if publisher and edition is the same as well