Well, moral extrapolation is a broader category than CEV. CEV suggests, for instance, that we should also take into account the social dynamics that would influence the development of morality (“grown up farther together”), while you could conceivably also have a moral extrapolation approach which considered that irrelevant.
(One could also argue that it is the addition of social dynamics which helps justify the notion of CEV(modern-humanity) = CEV(ancient Greece), given that it was technological and social dynamics which got us from the values-of-ancient-Greece to values-of-today. Of course, that presupposes a deterministic view of history, which seems to me highly implausible. It also opens the door for all kinds of nasty social dynamics.)
Well, moral extrapolation is a broader category than CEV. CEV suggests, for instance, that we should also take into account the social dynamics that would influence the development of morality (“grown up farther together”), while you could conceivably also have a moral extrapolation approach which considered that irrelevant.
(One could also argue that it is the addition of social dynamics which helps justify the notion of CEV(modern-humanity) = CEV(ancient Greece), given that it was technological and social dynamics which got us from the values-of-ancient-Greece to values-of-today. Of course, that presupposes a deterministic view of history, which seems to me highly implausible. It also opens the door for all kinds of nasty social dynamics.)