INI CET  is a national level PG examination. For the registration process the older version of your identity proof, your previous aadhaar card is acceptable. The reason is fairly simple because aadhaar proves your identity as an individual, the phone no is not written on an aadhaar card explicitly and the photo has fairly less to do in the registration process. All your documents including your previous degrees are already linked to your aadhaar no. and using the older one is no where a problem in this.