Sketchup to 3Ds Max issue

No need to export from SketchUp as a 3ds file, you can directly import the SKP file from inside the 3ds Max, use File > Import

What do you mean by “overwrites”, because if you import a 3ds file into SketchUp, this is a separate object, it comes as a Component and it doesn’t overwrite anything.

Just choose an insertion point and that’s it.

Make sure you set the same units in 3ds Max as those in the SKP file (File > Import > Options…).