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I'm not entirely certain what manufacturing process is used to make Coke bottles but if they use blow moulding, which is very common, then it is simply a case of making a different shaped mould. I don't see why that would require any more effort, and it seems unlikely that it would require any more power/"carbon".

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What about the rest of the process? Labeling machines, filling machines, packing machines etc etc. These are pretty much all used to round bottles.

That hadn't occured to me. On a large scale operation like producing Coke wouldn't these costs be quickly diluted by the large volume of containers that they are producing? Or do Coca-Cola contract many smaller companies that would have to change equipment individualy?

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