@NepalUsaXXX: I think Furke has already answered your question. Let me add some more information for you. Timi sanga SSN cha ra tesma DHS authorization only vanera lekheko cha vane thats fine, NO NEED TO REPLACE OR CHANGE IT.
Short story:
Just a week back I thought I need to replace or change my SSN and went to SSN office. Stayed there on a line for about 1 and half hour and when I had interaction with SSN officer came to know that THERE IS NO NEED TO UPDATE THE SSN since if you get hired you can show your EAD Card from TPS. He further said The only time you need to update or replace it is during change of status like if I am in F1 status and I got greencard or residency status then I need to change or replace the SSN but the number would be same but DHS authorization only written words gets erased.

So EAD card only will do the trick, though employer would ask you for SSN but you should always carry TPS EAD with you before signing hiring form.

Source: my own experience