Only if these are Apple branded adapters. But I've never found any USB charger to be problematic. Are you reporting you burned something up? Or just worrying.
I'm not a Mac person, but I do like ipods. My new car audio didn't like my (10 year old) ipod, so I bought a new ipod nano , which is good - no problems when it's half-way charged (it gets flaky on BT when it's less charged, I think!).
All I want to know is whether it is 'safe' to put the USB end of the Mac supplied cable into a generic car cigarette lighter/usb socket, or a generic wall socket/usb socket to charge it up.
Assurance on this point would be good! It's kind of scary to plug such a tiny thing as the Nano into a socket which is bigger than the device! (And, of course, asking this question on an Apple site is pretty futile).