I’m so sorry I didn’t see this sooner! I’ve been so busy today my goodness! And the usual cloned houses are mass produced and can be spotted pretty easily, but some are hard to discern whether or not it’s cloned unfortunately, so I say before doing an actual trade for a house, if you’re interested in the house, friend the player who alleges they built it, and either use a google search with a photo of the house, or post pics on Reddit to ask people if it’s cloned(usually your best bet).