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We really need a lot more details to understand how to best advise you. For example, you mention sharing a global concept. If you optimize each site for a specific country, you can duplicate content all you want without any concerns. More specifically, if you have 3 sites optimized for Spain, France and the UK respectively then the content can be duplicated and your rankings should not be affected. You can also offer some duplication within a site. For example you can write 10 articles on Ford Mustangs, then offer a generic page with a snippet from each of the 10 articles. If the latter page is properly set up, then it would not be considered as duplicate content. Can you share some example URLs so we can better understand your needs?