(4) Where the Comptroller has made an application under subsection (3), the Registrar of the High Court or the Registrar of Lands shall register the notice of security without fee, as if the notice were an instrument of mortgage over or charge on, as the case may be, such asset, and such registration operates while it subsists, subject to any prior mortgage or charge, in all respects as a legal mortgage over or charge on the asset to secure the amount due.