The Apple 45W Power Adapter could be one intended for another Apple product
other than early G3 iBook colors/clamshell model. ~ I was able to use an iBook G3
'yo-yo power adapter' with May2001 White G3 iBook; that was original equipment.
And the original product box had exact shape space to hold the yo-yo. That also
said Portable Power Adapter, and was 45W. (Output same as slightly later 45W
white adapter for G3 iBook White model that came out in 2001 or so. I have one.)
https://duckduckgo.com/?q=yo-yo+G3+Clamshell+power+adapter&t=ffsb&ia=videos
When I received white G3 (2001 500MHz 12-inch Combo 10GB HD/ 576MB RAM)
it also had a white-cube Apple portable charger -- which I still have although I sold
the G3 iBook white, with its own yo-yo power adapter. The non-yo-yo 45w is used
to simply charge a later model G4 iBook or G4 PowerBook. +Has illuminated plug.
One of the applications of the 'yo/yo style adapter' was not intended for use with
the early iBook G3 (colors/clamshell or white.) ~ Don't remember exact product it
was intended to support; plugs are slightly different or incorrect for iBook G3.
So you should be able to use the Portable adapter. An early G4 PowerBook
used a different yo-yo power adapter (looks alike) than those you show:
A "Powerbook-G4-Power-Adapter-Model-M7332" but label on ebay listing
said the above. Exactly. Not sure if DC plug was the same as iBook.
{My white Apple adapter that worked with G3 White iBook (same plug as clamshell
yo-yo for G3 colors) 'Apple Portable Power Adapter' has a model number: M8482
& date says 2001. Works w/ G4. Otherwise, same power output as clamshell yo-yo.}
Perhaps the lower power unit wouldn't toast with later cube Apple iBook/PBook
adapter; as some version adapters are backward compatible. While lower output
may have issue running larger display portable with better specs and superdrive.
I've charged a Mid 2005 iBook G4 12-inch 1.33GHz via early 2001 (white) power
supply; same one that was included as spare with yo-yo on early May 2001 white
iBook G3 first model. If I want to run the iBook, too; I have a higher output adapter.
If the plug fits correctly and it supplies power, it should be set to go.
Good luck & happy trails! 🙂