Why the different response of two Simulink models?

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I have two different models of a buck converter (see attached). In the first, the feedback summing junction has a negative sign forming the error signal and the PWM comparator after the PID uses "<". In the second, the feedback summing junction has a positive sign, and the comparator uses ">=". I fully expected the two models to produce the same response, but the second model has over twice the overshoot. Saturation limits of the PID made no difference. Can anyone provide a simple explanation of why the different response?

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