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^^^
Good start here. However, mass is based on volume, not surface area. So to properly compare them, we'd have to know how thick the metal is on both wheels.
For forge vs. cast: Forged is typically stronger than cast, but spoke design should play a role here too. For two identically shaped parts, with the same thicknesses; the process which made them should have almost no effect on the final mass, unless the forge comression significantly altered the steel's density. What you can do by forging a part is generally make it thinner. How much depends on the geometry and who engineered it.
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