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How did you calculate these propagation delay times? Elmore model? Probably you got a bit longer rising time delay. See the explanation in your Weste-Harris book, chap. 4.2 Delay Estimation, Example Solution, p. 163 in my edition: "Despite the fact that the rise and fall resistances are equal ..." (this is valid for a NAND gate, for a NOR it will be the other way round.