To my recollection, the former was a post-scarcity utopia that, like in most children's literature, east or west, didn't go too deep into the details (with the main moral of the story being 'don't be a dick to people'). I don't think it was particularly political.

The latter was satirical anti-cap propaganda.

Kinda true. The Soviet children knew there was no communism in the SU. But the book could give a clue on how it's supposed to look like.