Then nothing you can do besides clean up those lines in a photo editing program after the render.
Playing with different lighting will help to differentiate between to same color parts though. Have you tried the more realistic lighting setup posted by Bill Bogan (from autodesk)
-Most realistic output-
Create new light style
Delete all lights
General tab settings
Brightness=80
Enable Sky light
Intensity=90
Indirect tab settings
Ambience=40
Bounced light quality=medium
Shadows tab settings
Turn ON soft shadows
Highest quality
Density=80
Render command
High antialiasing
True reflections=ON
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Inventor 2023 - Dell Precision 5570
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