Yes, the plots look different.  The Workbench plot looks wrong. How can the pressure suddenly change from red to green when there is no contact?  It should be red all the way around the curve since that is where the pressure should be applied. Is there a mistake in the model that causes this plot to look wrong?

The Tutorial model plot looks correct. Red is continuous along the edge until the O-ring makes contact and only then does it begin to turn green and then blue.