You must be thinking about the original Wallstreets because the rev 2 models did fit the whole screen in 640x480 and 800x600 modes on the LCD (you were stuck with 1024x768 on the original).

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Thy why does my originally 266MHz w/66MHz bus PowerBook G3 that I later dropped a 300MHz CPU into keep the res 1:1 with the physical pixels?(black borders)Come to think of it I am not sure if I ever tried lowering the res in anything other than a couple games that it played very badly.

To be fair I have no idea if the logicboard was ever replaced. All I know is that it came to me with a 266MHz CPU and 4GB HDD so matches PDQ specs more than WS specs..

I could prop the display up on something and grab a bootable OS 9 CD and see what video chipset it has then tear it down and check for logicboard model number so we could see if Apple ever mixed boards or parts on the boards between the WS/PDQ.