It seems this is a well-known issue. While exporting a drawing to DWG, it ¨becomes¨ smaller. I already tried changing these config.pro options, and nothing happens.
Creo 4.0 to Autocad LT 2014
I already attached some things.
I have the following lines in my config.pro and I get correctly scaled (1:1) dxf & dwg files.
Solution: Change drawing units to mm and export DWG.