Describe imported vs migrated. Are you asking if you can skip the upgrade process and install a new version and bring over the data through an import / export process?
If that is the question, then the answer is ... of course!
You can treat it like a new install of Sage CRM and migrate the data using a migration tool or, if they don't actively use their Sage CRM currently and don't have much data, you could export out key tables and import them back in through MS SQL or through the import utility built-in to the product. (depends on the data being converted)