With both incomplete dominance and codominance,one expects heterozygous and homozygous classes to be phenotypically identical.

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For incomplete dominance, the heterozygous and homozygous classes have different phenotypes. For example, in a cross between a red flowered plant (RR) and a white flowered plant (rr), the F1 generation (Rr) would have pink flowers, which is a phenotype different from both red and white. 
Similarly, for codominance, the heterozygous and homozygous classes have different phenotypes. For example, in a cross between a black chicken (BB) and a white chicken (WW), the F1 generation (BW) would have both black and white feathers, which is a phenotype different from both pure black and pure white.

With Both Incomplete Dominance and Codominance,one Expects Heterozygous and Homozygous