Is there a difference between editions for college textbooks?

I'm a freshman in college. I'm a noob at this (lol) and I want to buy my textbooks at a cheap price, but my class requires the 4th edition of a book. All I'm finding on amazon.com and other sites like that are the 3rd edition. Is there really a difference between the books? Can i just buy the 3rd edition instead?... show more I'm a freshman in college. I'm a noob at this (lol) and I want to buy my textbooks at a cheap price, but my class requires the 4th edition of a book. All I'm finding on amazon.com and other sites like that are the 3rd edition. Is there really a difference between the books? Can i just buy the 3rd edition instead? Please help me out. Thank you. :D
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