They are both using different set of colours and tones so the file size will be different. I do not know for sure, there is more modulation of tone in the right hand image, PS has to render this therefore more pixel information is saved.
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They are both using different set of colours and tones so the file size will be different. I do not know for sure, there is more modulation of tone in the right hand image, PS has to render this therefore more pixel information is saved.