>>23409627
Well, they're not around by F90 either are they?
Jokes aside we don't know at this point, the manga is on hiatus and cut off at the point where they reclaimed the Inle, by all accounts the Mars arc is more or less over and the next step is the Earth arc, heading towards confrontation with SSD and the ZZZ Gundam but we don't have many details about that.
And for what it's worth recent materials (mostly F90 Cluster which is the first thing to really delve info F90 era Mars Zeon with any depth) suggest that it's more of a fusion of ReZeon and old Mars Zeon.
There's talk of a technocrat and militarist faction, with the former wanting to focus on the long haul and making a self-sufficient, sustainable living on Mars while the the latter wanted to take the fight back to the Federation. By F90 the militarist faction was dominant and Mars Zeon was committed to attacking the Earth.
To me the implication here is that after whatever happens in the rest of the Inle manga eventually the remnants of both groups had to learn to work together - Mars is a very hostile environment, limited terraforming or not.