You can swap the keys from an older iBook to get the translucent ones. I imagine PowerBook keys would fit too, but the keyboards themselves are not interchangeable. There are several different versions of th backlit keyboard, none of which will fit an iBook (or much else). The keyboard itself is not the whole shebang. PowerBooks shipped with the backlit version have two ambient light sensors which sit under the speaker grilles and connect to the logic board. The top case is also a different part on the PowerBooks where the backlight was optional.
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