The original realm is still standing, it was only a duchy that switched. Therefore, it is not a realm-merger.
If I put all of my realm into the same duchy, and then create a second one-region duchy out of a dinky townsland, and organize myself for a badland to join the dinky duchy and for the townsland to then join the main one, and then switch that duchy to another realm, effectively moving all regions except for the badland. Would this not be a realm merger?
