Maybe you know it but I would like to clarify: one uses incident light metering and reflected light metering in different ways.
Incident light metering: the light meter is placed in front of the subject, the cell with the dome pointing toward the camera.
Reflected light metering: the light meter is placed near the camera, the cell without the dome pointing toward the subject.
If the subject is of average brightness (reflectivity) you should have more or less the same exposure always.
For an accurate comparison you should measure, while in reflected light metering, a grey card without projecting your shadow on it, filling the entire frame with the grey card. That should give you a value which is very close to the incident light metering.