So, in my mind, A-City's map version goes to much against what the manga shows. You can't dismiss the primary canon scene because the secondary/tertiary canon map contradicts that. The main work will always take priority if they contradict per our rules.
City Z's section, despite me not initially liking it, does make a lot more sense as an upgrade. The mountains being destroyed, the towns surrounding City Z being destroyed and the implied level of destruction itself is fine. I will say, however, that while that does line up, the anime also puts a hard 10 Gigaton cap onto the meteor, which would still be enough to kill everything just due to the raw amount of environmental destruction.
So in my view, no on City A, but I think the City Z end is usable.