It depends. However, many texts will actual discuss changes from the previous editions in the preface. Some editions are completely different. But most just have subtle changes. You will have a difficult time finding page numbers, however, if you use...
I've purchased Int'l editions on numerous occasions, and each time they were EXACTLY the same as the regular editions. Save your money.
You know, I didn't know that there were deluxe editions for Sorcerers Stone, Chambers of Secrets, Prizoner of Azkaban, or Goblet of Fire until you asked. I have searched and below are the links to some sites that have the deluxes editions for some of...