However, I found, that URLs don't change as much as the titles and slightly edited texts - it will happens if course, but to go beyond that you would need a similarity hash of the actual content of the page and even that reaches it's limits pretty quickly:

Sometimes a change of title + few edits can change the whole narrative of a near-identical article. Looks like currently even ai can't solve that. And interestingly I've seen that happen even for pretty large newspapers "whatever clicks"...

Since zebra is meant to enable debate/exchange of perspectives on specific contents I think only URLs give some degree of certainty about pointing to the same content.

Happy to hear other ideas!