I do Cambridge which is more or less the same, and I'm afraid to have to big losses the answer is no. The diet works primarily by burning fat, which it can only do once all the carbs in your body have been burned as it burns carbs first. In order to burn fat your body needs to be in a state of ketosis. This is achieved by having very very low carb intakes, anything more than the carbs in the diet packs is too much and you'll come out of ketosis.
As a general rule if I have carbs, which bring me out of ketosis I automatically put on 4lbs. This is because the human body burns carbs first as they are easier to burn than fat stores which may have been laid down a long time ago. Ketosis stops you feeling hungry too.
So if you were to eat a pasta dish you'd never get into ketosis and therefore you'd always just be burning your pasta carbs and could feel more hungry. And you'd always have that extra bit to lose before you start to burn fat so your losses won't be as big and more likely on a par with diets like Slimming World and Weight Watchers. To me I'd rather get into ketosis and stay there, so that the losses are bigger, and the diet is shorter.
Slim Fast works differently to CS, CD, LT and LL because its the calorie intake, it isn't designed to be a total meal replacement and as aresult does not have all the recommended daily amounts of the nutrients needed, and could make you malnourished if used as total meal replacement like CS.
Hope this helps, I know it's probably not what you wanted to hear though, sorry xxx
