You can specify the degree of visual fidelity that will be maintained upon export.
On the Text & Fonts tab of the Modify DWG/DXF Export Setup dialog (see Exporting to DWG or DXF), you can map Revit text fonts to specific DWG/DXF text fonts as needed.
From the Text treatment during export drop-down list, select one of the following options:
By default, all the Revit fonts listed in the mapping table have a value of {Automatically map font} in the Text Fonts in DWG column, which means the Revit font will be maintained in the exported file. If you want to map a Revit font to a specific DWG text font, click the value for that font in the Text Fonts in DWG column, and then select the desired font from the drop-down list.
You can click Reset All to change all the DWG font values in the table back to {Automatically map font}. Alternatively, you can multi-select rows and click {Automatically map font}.