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.
"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.