Yes, dear Vishal, both are different things after 12th you get both things after some time of your 12th result. You can get both things from your recognising school. For more information you can contact your school other you can visit on the official site of CBSE.

All the best

No sir, 12th marksheet and certificate aren't the same. The marksheet shows the marks scored by you in the exams; while the certificate shows that you have passed your examination and are eligible for further enrollment in colleges or institutions.

Hope you got your answer through this. Thank you!