Nope, sorry. The iBook G4 uses PC-333 laptop RAM (IIRC, I sold my iBook G4 1GB RAM stick to a user on here) while the MacBook uses either DDR2 (PC2-8500) RAM. Plus, the physical pin layout on MacBook RAM is different than the physical pin layout on iBook RAM.
Awww 🙁 I sold my old 1GB iBook DDR RAM for $27 on here to a user... Whatever.. The iBook doesn't get any use, so it's kind of "free money" for me.
Also to connect a MacBook HDD externally, you would have to get an enclosure, like this one. It has both FireWire and USB, so you can boot off of it. PowerPC Macs, such as your iBook could only boot off of FireWire.
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27's a pretty good deal! It looks like it'll set me back 41.99 from OWC, if I decide to buy it there... going to scope around and see if there's anything cheaper, first. (Hell, I only have 768MB thanks to my old laptop using the same RAM as the iBook...)