It seems that you have your blog site in another WordPress theme other than Flat-responsive. So, there may be difference in Theme like widget position, customizer Setting etc. so using duplicater, you can’t find the solution you want.
you can export all content and import in another site. To Export Content please go to Tools > Export and choose the content you want to copy to another site and then click on ” Download Export File “. it’ll generate xml file.
after export you can import download xml file to another site. To Import, go to Tools > import, select wordpress and you may be prompt to install plugin if you haven’t installed already , upload download file and select ” upload and import file ”
You may noticed Missing style in imported content.. to have same style as older site, you need to manually copy and paste style using child theme