So I'm going to restart mine, since it's picking up glitches all over the place like mad, even with the permitted move to fix the aging glitch (my favorite one is when moving, the save-under-new-name overwrites the old-with-a-different-name).
And as I'm going through the rules again, and I want to confirm that the moving heir's spouse can do the same careers as previous world founders. But future moving spouses cannot do the same careers/skills/challenge completions (even by accident) because, when the move, they then become founders of the new world, and neither founder can do any of those that have been (or will be) completed by an heir.