The texture scaling of an imported CAD file is much smaller than that of a standard engine primitive or imported fbx.
Found in 4.19 CL# 4033788. 4.20 CL# 4369336, 4.21 Preview 2 CL# 4472090
The texture scale will be much smaller than the fbx primitive
The texturing to match that of a fbx primitive
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-65401 in the post.