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Rice has a satiety index of 138 while potatoes have a satiety index of 323, almost 3 times as much. So you need to eat way less potatoes compared to rice, I don't know if it's a linear scale though but still probably brings potatoes pretty close to rice.

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Satiety index affects how much you want to eat, not how much you need to eat.

But the point of this diet is that potatoes have a very high satiety so that even if you eat as much you possibly want to you won't eat enough to put on weight. Rice, with its lower satiety, is much easier to overeat (or eat enough to maintain a higher weight).

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