While it is easy to point to the similarity with the Society's reversals via "new light", it is important to recognize some big differences.
Although Catholics have long believed that children who die without being baptized are with original sin and thus excluded from heaven, the Church has no formal doctrine on the matter. Theologians, however, have long taught that such children enjoy an eternal state of perfect natural happiness, a state commonly called limbo, but without being in communion with God.
If the Society weighs in on any topic, it becomes a binding article of faith. Beliefs come only from the "organization," not from theologian freelancers. There is no such thing as a JW theologian, for that would require an independence of thought on religious matters, and this would be criticized as "running ahead of Jehovah's organization". Catholic theologians, on the other hand, are free to think their way through different theological problems, including the case of children who die before baptism.