Dear aspirant,

it is better to carry both the certificates with you while the admission process for B.tech. as both the certificates are issued by the government, both the certificates are valid to use. It is better to carry the SSC certificate which you have used for your earlier studies before b.tech. If you have used the certificate contains of grades then you can use the same certificate for admission process in b.tech.

It is good  to carry both the certificates for the counselling process and other admission process as it will be safe side.

hope it will be helpful