I'm not sure about this but... is it possible that by changing the viewing direction of one of these two models by 90 degrees the mode shapes will have the same appearance? I see what looks like "ovalization" in the upper plot and bending in the lower one. If the geometry is axisymmetric (acoustic medium inside a cylindrical pipe) one model might be calculating one of these shapes when viewed along the x axis and the other when viewed along the y axis. Or you might try an isometric viewing direction and creating animations of the mode shapes.
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