In the German vintage MTB forum there is a pic with a falt crown Champion Mondial ATB in het Mountianbike Museum in Arnhem:
https://www.mtb-news.de/forum/t/mtb-museum-arnheim-infos-fotos-termine.968167/post-19998500
I do not recall seeing another early flat crown model.
The bike in this 2011 thread was my first Champion Mondial ATB. I do still have it. I have used it quite a lot through the years. It is a nice riding bike: both on and off road. Later I acquired a NOS frame in the same paint scheme with Campagnolo Euclid headste installed. They were unique frames. The other example does look a lot like this one, but it doesn't have water bottle mounts for example. Common for a cyclo cross bike, but not so much for a mountainbike. Finally I got hands on blue frame without fork.
These early Champion Mondials ATB models were superseded by welded Reynolds 853 frames with a more modern geometry. Also built in Dieren, NL. There was also the Titanium Pro, but that was in fact a Raleigh.