The two Diamond Dog Kingdoms?

TheQuietMan
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House of the Arcana
So for those who read Friends Forever #6, there’s already a diamond dog kingdom by the name of Diamondia. However, in season 10 comics they act like they haven’t visited one before so it would make sense that it has been retconned.
 
However, what they’re visiting is a “hidden kingdom”, so is it possible there are 2 of them? The outside kingdom of ugly diamond dogs and the more inside one full of normal good looking ones?
 
As a bonus to another retcon mentioned in the link, it is possible Cassie is a different species of Kelpie, much like Silver Quill’s oc and the actual hippogriffs.
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