Probably not. The A/B/C/D iMacs all use nearly identical motherboards and the processors are completely swappable between them, so if there is a bondi blue machine with a 266 or 333MHz CPU, it's likely an A or B motherboard somebody swapped a new CPU into after the fact.
Apple was mostly good at not reusing things like that after ~1997. Apple would have stopped manufacturing the /233 iMacs before the public launch of the /266 and once the 266 launch would have sold 233s at a minor discount. (You can see this in period publications and catalogs, the discount wasn't much, I believe $1,259 was typical for the /233 once the /266 launched at $1,299, but I'd have to go look to be 100%.
In the intervening 20 years they've gotten so good at just in time production and lean operations in general that there's usually very little stock of older versions of things to sell when a new version comes out.