Well, the different translations of TSB have different covers, and I would assume they have different page listings. For example, the Czech translation is a very large hardback, and the German version is TSB and TSR compiled into one book.
As far as I know, the only English editions of TSB are the Avon Books paperback and the University Books hardcover (which is extremely rare and goes for several hundred dollars now). If you are referring specifically to the English version on your website, I don' t think you have anything to worry about.
Some boys grow up into men who can look at themselves in the mirror in the morning, and others just go along with the crowd, forgetting after a while that they ever had a choice. ---Roger Ebert