Satellite view position problem

I'm still working on FSX Madagascar project with SBX.
Presently precise satellite views have been largely improved with GE and VirtualEarth.
Because of clouds or imprecise areas, I have to work with both.
However, I've got trouble with position of views; when changing between 2 satellites, there is a shift of about 20m. Similar problem when changing from zoom 16 to 17 in GE.
Is there a way to know the right position?