That´s the first time I hear this. Always was said the Retail CD is needet for special things and for installing it everywhere. From 6100 up to latest G4.
And now you tell me that in case of G4s the G4s neeed the original CDs and can´t boot from the verry expansive sold MacOS 9.1 , ... ?
Maybe you are right (where to get a working 9.2 from, ...), but what the hell heappened to Apple back than? "No for the langage Kits (etc.) you need the ReatailCD for $150 extra, ups sorry the CD doesn´t work at your computer, even if the original system software is the same 9.1", ...
:-/