It would work but after the import, it may not look exactly like the demo. The only way that you can have an exactly same site as demo is to reset your site using WordPress Reset plugin.
Please be aware that once you use this plugin, all your current database will be deleted.
To install and use the Wordpress Reset plugin:
Step 1 - Login your admin Dashboard >> Plugins >> Add New then search the keyword Wordpress reset >> Choose WordPress Reset >> Install Now >> Activate
Step 2 - Go to Tools >> Reset