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Yes.
Plainly and simply, yes. It has to, be definition.
A USB port outputs, IIRC, 500mA, 5V - any USB AC adaptor will, therefore output the same. So, if a player is designed to charge via USB, it will also charge via a USB AC adaptor.
It's no different to buying, say, an after-market/third-party charger for a mobile phone, or an iPod, or whatever.
Of course, there will always be some cheap charger that faultily outputs too much current or too high a voltage or something like that, so there is a slight risk. But probably no more than the risk of an official AC adaptor malfunctioning and frying your DAP.
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