ZEN VISION screen pixels question

The ZEN Vision spec sheet said: screen size 3.7", 640x480 pixels
ZEN Vision-W spec sheet said: screen size 4.3", 480x272 pixels

The screen of ZEN Vision-W is bigger but the resolution is less, does that mean the picture quality will be less clarity if compare to regular ZEN Vision OR I MISS SOMETHING ????

http://www.creative.com/products/product.asp?category=210&subcategory=211&product=12985&nav=1

http://www.creative.com/products/product.asp?category=210&subcategory=211&product=15752&nav=0