I think the major difference lies in the coarse versus fine mesh but not for the obvious reason. The coarse mesh leaves a greater amount of mass placed at the end points. These end points are anchored (the way I modeled them) and that eliminates that (anchored) mass from the model. Less mass leads to higher frequencies (for the same stiffness).
I think the bends, too, affect the mass distribution more so than the system stiffness.