Aside from sole source contracts like Costco has with JCI, the only way to be reasonably certain who makes a particular battery is to check what's on the shelf.
The NAPA batteries here aren't made by East Penn, at least in the sizes I usually shop.
Supply source can shift even within a manufacturer. A little over a year ago, the stock of the JCI battery I needed was coming from their Saudi joint venture. Now, the stock on the shelf is coming from Mexico again.
Look before you leap.