Excuse me? yes it does. The only difference is how the screen is hooked up. It goes through the Whisper/Personality card on that header with the clips. In fact it's so similar, I transfered mine to a G3 minitower which eissenfaust88 here on the forum has. I also upgraded it with a G4 Zif. It's the EXACT same board as the rest of the G3 towers, except with a lower end config and a built in screen that attaches to the personality card.
You can see evidence just on the card that goes into the personality slot on any G3. That 9/15 pin header with the clips is just for the monitor on the AIO to connect.
the iMac on the other hand is drastically different. I would akin it slightly more to the blue and white over the beige G3 though.