http://en.wikipedia.org/wiki/Pixel_a..._video_formats
PAL uses wider, more rectangular pixels than NTSC though, so you can't really compare the aspect ratios based on number of pixels.
Pixel Aspect Ratios:
Standard 4:3 PAL: 1.09
Widescreen 16:9 PAL: 1.45
Standard 4:3 NTSC: 0.90
Widescreen 16:9 NTSC: 1.21
Square pixels are used in most high definition formats though.
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