Why would there be different pin-outs? I'm sure that the pins that handle power are standardized in the USB specifications, and all USB cables and USB chargers should conform to those. Otherwise, plugging your DAP into a computer USB port that wasn't 'designed' for it would fry it as well.
Now, why some devices are so picky about what adapters they can use is still a mystery to me. Most of mine don't have any problems, but for some reason my cell phone only works with some chargers. It's picky about what USB cables I used to connect it to my computer, too.
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