When it comes to duplicate content, Google typically compares one web page versus another web page. So, if the site does have a different company name (franchise name) and carries a different set of products or a some similar products, then it sounds as if the pages on the site won't be considered duplicates. They may be similar, but not necessarily duplicates. It would be best to make sure that each site doesn't use the same exact web design template, as well.
You can run the site through Copyscape.com and Siteliner.com to identify duplicate content issues with the sites. Most good writers will be able to write the content in a way that talks about the same products or services but doesn't include the same text as other sites.