Hello,
could you share the model with us? Send me or @Antoine_Guillo the model in a private message.
Import directly in UE is a completly different process so it is nor surprising to get different results.
Are you using the “import as Nurbs” option?
Can you try to see what happens with the “import rhino meshes” options?
Anyway you are right, the udatasmith pipeline should work better.
Bests,
Flavien.