Yeah, it's mostly just the size. No colour pages either. A very low effort release even in Japan.
The collection title is a bit weird since it feels like the Eternal Editions should really been called the "Naoko Takeuchi Collection" as they are the nicer editions or save it for a release of the colour editions.
Sometimes I think to myself, the Eternal Editions are a little too big and would I prefer these smaller editions, but I've already spent a ton on the former.