This 65 W Apple Power Adapter is used with these computers: Can be used for 45W models as well. 
PowerBook G4 (1GHz/867MHz) 
PowerBook G4 (15-inch FW800) 
PowerBook G4 (15-inch 1.5/1.33GHz) 
PowerBook G4 (17-inch) 
PowerBook G4 (17-inch 1.33GHz) 
PowerBook G4 (17-inch 1.5GHz) 
The 45 W Apple Power Adapter is used with these computers: 
PowerBook G4* 
PowerBook G4 (Gigabit Ethernet) 
PowerBook G4 (DVI) 
PowerBook G4 (12-inch) 
PowerBook G4 (12-inch DVI) 
PowerBook G4 (12-inch 1.33GHz) 
iBook (Dual USB)* 
iBook (Late 2001) 
iBook (14.1 LCD) 
iBook (16 VRAM) 
iBook (14.1 LCD 16 VRAM) 
iBook (Opaque 16 VRAM) 
iBook (32 VRAM) 
iBook (14.1 LCD 32 VRAM) 
iBook (800MHz 32 VRAM) 
iBook (900MHz 32 VRAM) 
iBook (14.1 LCD 900MHz 32 VRAM)