Textbooks? Will the International Edition be adequate for a Health and Wellness college course?

I used to buy the international version of my textbooks sometimes on half.com (alot cheaper than at the bookstore)...and the only difference between the book was that the international version was lighter.--> They are paperbacks instead of hard cover. Also sometimes the pictures weren't in color like the US version. Same words, same chapters, same questions, etc. It's still the same author and his same work of course....just a different binding company I guess. Hope that helps.