There are really only 2 editions of the Catechism. You are probably looking for the 2nd edition (1997).
The
green covered one published by the Libreria Editrice Vaticana/USCCB Publishing is the one I would recommend, even though it’s a bit large. In edition to containing the modifications made from the 1st edition, it also still has the Glossary, which is handy. Many of the pocket-size printings from other publishing companies do not have the glossary.
The full text is available online:
scborromeo.org/ccc.htm. That website also lists
the differences between the 1st and 2nd editions, most of which are relatively minor.
If you want to go all out, you can special order the version from
St. Paul’s Publishing in Australia. It’s a bit pricey, but it is a pocket-size version that contains the full text, all the indices, and the glossary. It contains everything in the big green version but at a fraction of the size.
Happy shopping.