you will have to use two different Mechanical systems to compare them side by side.
Or if you want them in a single mechanical window, you can import two overlapping geometries, carefully group them in two different named selections, and use the element birth and death feature to kill one group that is meshed with one mesh type while keeping the other alive which is meshed with other mesh type:
you can have either 2 or 4 viewports in single Mechanical session.
-Aniket
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