I just stumbled across this old thread while looking for a similar topic. There would be a difference in bottling sugar required for different sized bottles... no one was stupid. It's just a question of if the difference is noticable and worth consideration.
I'm a relatively novice brewer, but I'm also a physics teacher. Here's my just-thought-of-this-for-the-first-time response... there could be other factors involved, from pure theory the amount of air space relative to liquid would affect the pressure levels, because before the liquid absorbs CO2 it would first off-gas into the airspace, and the airspace would have to pressurize as well as the gas. For talking purposes, say this is 12psi. Air compresses but liquid does not, so the more airspace to pressurize to 12psi the more CO2 would be necessary, which means more sugar.
Think of it in extreme examples, and say that you wanted 12psi in your vessel to carbonate your liquid beer. Imagine a bottle-worth of uncarbonated beer poured into a keg... how much CO2 would need to be produced by that amount of liquid to pressurize the entire keg enough to carbonate that amount of beer? That's a lot of air that would have to be compressed, so it would take a ton of sugar! (and more liquid, etc... this is not a realistic example, it's to discuss extremes to visualize the concept).
Now imagine that the keg were filled up so that there were only a tiny bubble of air on top... not much CO2 would be required to compress that tiny bubble and generate 12psi, therefore less sugar would be required.
These are extreme examples, but you can see that it could apply to a keg vs. bottling, or even bottling a 22oz vs. a 12oz. I don't know how critical this would be, and imagine that it's negligible, whereas with a keg the rule of thumb is 1/2 the sugar necessary for bottles (about 2oz per keg vs. 4oz for bottles).
If you try both methods, please post the results! A simple way to test, and something that I've already done without realizing it, is to use your normal sugar amount and bottle mostly 22oz with a few 12oz's. Carbonate, then open side-by-side to look for a difference. From memory, I didn't notice a difference.