KB83802 details some of the limitations of this. In your case it appears you are moving from a parent domain to a child domain within the same forest in which the user GUIDs may not change and the same Registered LDAP server would still be able to access them so this KB may not be applicable.
If you are moving from one forest to another, the GUIDs will be different and KB83802 applies.
Thank you very much for the information which you have shared. It answered all my queries.
In this case it is AD migration from one domain to another.
Thread can be closed.