Should different editions of a textbook be part of the same work?

[Pablo]

I'm sure this was in the Librarian Manual, but I can't find it.

Should different editions of a technical textbook be part of a single piece of work?

I'm referring to first edition, second edition, third edition, where the actual content of the book changed to show new techniques, use up to date tools, etc. I'm not referring to separate mediums like kindle vs paperback.

To me it feels like they should be separate pieces of work with separate ratings and reviews.