Even in google image search, I couldn't find any photos from inside this device.
That has something to say, because there is almost no other device without pictures.
(If you are lucky enough to see a type designation of the fan, you can determine the mass in the data sheet).
Any estimates or inaccurate hearsay bring you nothing.
Since you would have to open it for the conversion anyway, I would open the DG1022Z in your place now,
measure the fan myself and then know it exactly.