Different publisher/ISBN for same textbook - okay?

<p>I need to buy Larson's Calculus of a Single Variable for my math class, and the ISBN given was 0618503048. It's an 8th edition, January 2005 printing from Houghton Mifflin. However, another textbook, with a different ISBN (061850303), is also an 8th edition, January 2005 printing, but from Brooks Cole, and it's much cheaper. Do you think the publisher difference is negligible? After all, they're both 8th editions with the same printing date...</p>