Im not sure but I think there might be like one or two different cells and a dozen different wrappers .
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I'd bet money on that. Like most goods, there are only a few factories that make a certain item and then depending on the supplier, they'll get different labels slapped on them.
This reminds me of the time I was commissioning a project at a well known oil filter plant in Tennessee. It blew me away when I saw that innards where exactly the same across quite a few of the major brands this particular plant supplied. It kind of put all those "this filter is better than x filter" in perspective, since they were exactly the same!