Hello aspirant, hope you are doing good.

So, CSAB stands for Central Seat Allocation Board. Special Vacant Seats are filled in this process known as special rounds , being conducted by Central Seat Allocation Board ( CSAB ) to fill the vacant seats at NITs, IIEST, IIITs and other GFTIs (Except IITs) after completion of all the JOSAA rounds. So, yes definitely , you can get a seat in CSE or IT in any of these colleges , if and only if there are enough vacant seats in those branches, and your rank is good enough out of the rest of the students in CSAB rounds.

You can check details about the CSAB special round , here:

https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis

Hope this helps you. Good Luck !!