Sure you could. Power requirements are the same, screen resolutions are the same. One thing you might try before you go and modify the connectors though... I haven't checked my G4 yet, but I know that this holds true with the Clamshell iBook screens and the Dual USB G3 iBooks. You can remove the shielding tape and there is a flat, 20 pin connector at board on the back of the LCD. That connector may be the same for both. If it is, just use the G4 cable and you *SHOULD* be good to go. This is not from an iBook, but the same kind of connector I'm talking about.
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"Far better it is to dare mighty things than to take rank with those poor timid spirits who know neither victory nor defeat." - Theodore Roosevelt

-USMC Corporal Hess Sherrod B:6/6/84 D:4/6/09 I miss you, my brother.