Hello-
I did not notice color changes when I copied from 2017 dwg to the next. However, since you're trying to copy these to a lower version of ACAD, I recommend exporting to a lower version first, then attempting to copy and paste to the older version. I have converted your dwg to 2010 version.
I hope this helps.
Michael M. Carlson
Senior Civil Designer
CADD Manager
AutoCAD Civil 3D Professional
AutoCAD Professional