Hi,

A slight change in signature generally happens due to the digital signature taken at the RTO Office while making the driving license while for CAT we sign on a piece of paper and upload it online. If this is the case, it will be clearly evident to the invigilator and would not be an issue.

However if there is a major change like just initials are written in CAT signature while full name hold in License etc. then it will create an issue.