"Will a import DVD-A play on my player if it's set up for NTSC playback?"
Yes, the audio tracks will playback. To see the PAL or NTSC video image content depends on your display device capability.
"Do the same rules apply to DVD-A as import PAL DVD?"
Do you mean regioncoding? So far as I now the audio content is not region coded. I'm not sure about the video content because my player is regionfree so I cannot check this out.
Frank