I live in France and went to DLP many times.
The first thing I should say is that the original track layout of Space Mountain was kept for the Mission 2 version ... the only difference is the theme ... and the breakdowns (few months after the reopening, many of the effects went off ... even the onboard music doesn't work now !).
I also had the chance to ride the Magic Kingdom's version ... and the only things they have in common are the name and the shape of the building ...
If you want to know more about our version, here's a really nice documentary (taken from the BBC ... everything is in English !) :
http://www.mousefiles.com/videoshootforthemoon.php