The main differences between the two are angle and temper. Cold chisels, due to the increased impact and chance of chipping, generally have a wider angle on the edge, about 60 deg if I remember correctly. They are also tempered to be less brittle. Can't remember the color range so I usually look it up. Pretty much every book has a chart on it and there are many websites that have it too. I think it's around straw yellow or bronze but look it up to be safe. Hot cuts are usually thinner angled for easier cutting and can be tempered more leniently since the heat will draw some of the temper if your not careful and the metal you are hitting is softer than the chisel anyways. As for handles and length, I've see handles on both and they may be the same length too, depending on use.
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