Not familiar with cloud based APs, but I assume they are still
registered via the support portal - if so, I think you can just open a
CS ticket for a require action.
If you search the forums, you should find various responses to this
question from manually editing the old config (replacing the header and
any interface references that differ between the two models) to using
the FortiConverter (if both models/firmw...
We manage/maintain about 40-50 fgt in the field (200D/101E/92D/80E), in
mostly remote areas - all educational type institutions, so the
requirement for us is the model is still supported by Fortinet and/or
the subscription can still be renewed. Then ...