Yes SR had used this number in other train. We have to see if SR gives another number to this train or SR thought of not running HLZ-MAS Exp again.
Zone change honeka chance kaam hai.... Hoga toh bhi ANVT-HLZ Exp k saath RSA karne ka option hai lekin ANVT-HLZ Exp ka bhi alag se RSA hai ANVT mein. So not possible