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Does ethanol derived from cellulosic feedstock or sugar have the same Equivalence Value as ethanol derived form corn starch, i.e. 1.0?

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Yes. Equivalence Values are based on energy content in the fuel, adjusted for renewable content in comparison to denatured ethanol. See 80.1415(c). Ethanol from starch, sugar, and cellulose is all chemically identical, and is all 100% renewable (none of the carbon in the fuel comes from a fossil fuel source). Thus, all such ethanol has the same Equivalence Value.