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Fixed-Frequency Current mode of flyback converter

I was looking for a fixed frequency current mode of a flyback converter, and below are two different papers presented by the same author. But there is a difference between the two models that I did not understand:

1. Paper 1 APEC seminar 2011 (The dark side of flyback converter):

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2. Switch mode power supplies: SPICE Simulation and practical design:

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If we compare the two models, we see a difference between the first pole and the DC gain expressions given in the two papers but I do not understand why there is such a difference even though both models are in "Fixed-frequency current mode"

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