It depends on the spread of the 2 diamonds - how they show their weight face up. You could have 2 diamonds of 1.5 carats, one of which has a normal depth, the other is cut more shallow. The shallower diamond could look larger than the one with the greater depth, it all depends. The diameter measurements are usually the thing to look at as these will tell you how large the diamond looks face up. Weight can be hidden in various ways too such as with a thick girdle. Think of 2 people of a similar weight, one may be taller than the other and look thinner too, it just depends how the weight is distributed, same with diamonds. Also once you get into a larger carat weight, face up size differences are less noticable to the eye too.
I misread the proportions of the 1.58 - I thought it said the table was 57 and the depth was 62.4, this could have the effect of making the diamond look larger for its weight as it is a shallower cut diamond. Often though the actual visual differences between carat weights and face up size of diamonds isn't as great as one might think.
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