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I'm also following "The symbiotic relationship between a rabbit and a black panther", and I'm being convinced they happen in the same place.
Both the kingdoms are called Nergen, both the kings are named Seiblian (spelling may vary), and in one chapter Abigail was meeting rabbits when one of them looked exactly like Vivi, the protagonist of the other isekai.
There's even this "green disease" in both works!