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Deferent engine Results in SewerGEMS

I am getting big difference when I run the Storm Network model using Bentley EPA SWMM than the supplied EPA SWMM 5.0.12, it is the same model and the same parameter, I just switch between two engines; 

I got 8.17 m3/s at the outfall by using Bentley EPA SWMM, and I got 10.55 m3/s when I run the model with EPA SSWMM 5.0.12. That is a huge difference. the model shared for troubleshooting (Bentley EPA SWMM & EPA SWMM).

Why that difference? which one is more accurate and to be used? please justify both results.

Bentley EPA SWMM

EPA SWMM:

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Regards .... Mohamad Azzam