Can I replace the screen data cable with a later version?

The LVDS cable socket on the logic board is the same on the two ibook models but it's true that the LCD panel socket is different. Swapping the two panels and using the 1.42 LVDS cable shout work but maybe you'll have to remove the modem in your 1.33 to reach the logic board socket.

Did you know that you can replace a ibook G4 14" panel with a iBook G3 14" one ? They are compatible and you can use your 1.33 LVDS cable.

If you bought a 1.42 ibook G4 complete assembly you will not be able to swap the panel to your 1.33 machine without swapping the display internal cabling cause the 1.33 & 1.42 machine use different inverter cable, microphone cable and the reed switch magnet (that triggers the sleep function) is located in the LCD panel on the 1.42 model unlike the 1.33 (the magnet is located on the optical drive).