DoMS IIT Madras - Department of Management Studies

Hello Abhinav,
No, you cannot as the candidates should possess a valid score in the Common Admissions Test (CAT) conducted by the Indian Institutes of Management and not MAT scores.
You may refer:
https://doms.iitm.ac.in/index.php/admissions/mba-admissions/eligibility-and-selection
Following are the top MBA colleges accepting MAT scores:
https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india-accepting-mat/2-2-0-0-306

But they have already closed the applications for MBA.

You need to secure at least 50 percentile in MAT examination. However, if you have not appeared in either of the competitive examination, you may request the institute to consider you for their Internal Online Examination (IAAT) to qualify for the PGPM + MBA degree programme.

Both degrees have their own values. it all depends from which Institution you get your degree. When we say Institution we also cover university affiliated colleges. Majorly before joining you should focus on counting what emphasis a college/institution is giving on the teaching practices and industry oriented sessions for your knowledge development.