Most of the heavy syrups (molasses, glucose, honey, barley syrup, corn syrup) have similar weights per cup. Maple syrup tends to be a little lighter because it generally is not quite as dense a syrup, it depends on how much it's been boiled down.
There's also some variability to honey, but it is generally somewhat denser than maple syrup. Interestingly enough, while many sugar solutions, including maple syrup, are measured using the 'brix' scale, where the higher the number the more sugar is present, honey is measured in terms of the percentage of water in it, so the lower the number the higher the percentage of sugar.