In case you’ve already customised some item and wish to have exactly the same one in the other room, you don’t need to search for it in the catalogue and do the customisation all over again. 

You can simply duplicate the existing item.

Pick the item by tapping on it and use the Duplicate icon.

In case you're using another platform (iOS, macOS, Android, Windows) a Duplicate option will also appear after you tap on the object.