Hi,
In file NEGOZIOD.dxf
R-click on the layer ‘ARREDO NEGOZIO’ in the Layer List
Choose Select Layer Entities (Y+)
Copy with reference (RC), indicate a known edge, endpoint or intersection of the building layout as reference.
Choose the copy reference so that is definitely at the same spot in both files.
Can’t give you any advice as both drawings don’t correlate in detail.
e.g. the target room is 831 meter wide … 
While for the source room that is 834mm
Swap to file LABORATORIO.dwg.dxf
Paste (PS), in the Option Toolbar: Rotaion 0, Scale 1000 … Nothing else.
Indicate the same known edge, endpoint or intersection as target.
Ready
You need to scale it up because NEGOZIOD.dxf is in mm and LABORATORIO.dwg.dxf is in meters
There are many little to larger issues in both drawings.
One should avoid drawing on the layer ‘Defpoints’ nor set it as a sublayer!
Regards,
CVH