With adult fiction classics, there are many different printings, some include forewards, introductions, historical notes, a few pages of illustrations, etc. Unless it's certain there's a difference in the text of the book, these do not need to match. Large print edition requires a separate record. Children's fiction Title needs to match. If book is mainly illustrations, and illustrator is main entry, there will be a separate record for each book.
Title needs to match.
If title has a date in it, it usually requires a serial record, also called open entry record or monoset. Look at the verso of title page for ISSN 0000-0000 to judge. There are guidelines for adding holdings for the individual issues of these titles. All of these require a separate record. Some publishers will not indicate a different edition, but if the subject is non-fiction, it probably indicates the text is different and a separate record should be added.