[Brightcolours]

But what is the mangification factor? I.e, even they use a smaller sensor is the registration distance the same ?

Hmm? Magnification factor? You can calculate the crop factor if you want, the sensor size of the current model is available on the manufacturer's website (and elsewhere) 

 

Of course the flange distance is appropriate for the used mounts, else the cameras would be quite unusable. So for the EF/EOS mount model the EOS flange distance, and for the MFT one the MFT flange distance, obviously.