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Domino does not store the current HTTP password or NotesID password in clear. We can not know if the new password differes by X characters from the previous password since. there is nothing to compare with. Storing the password in clear(or encrypted but reversible) is a really really bad idea. Rejecting this idea for security reasons.
If you want to implement the above and/or want to set a limit for the number of times a password can change per day, consider using SAML/OIDC against an IdP of your choice where those rules are implemented.