Hello there!

KCET, COMEDK and Uni-GAUGE exams are different from each other.

KCET is a Karnataka state level engineering exam which can be taken by students of Karnataka only. 

COMEDK can be taken by students from all over India(including students of Karnataka ), hence it is open to all for admissions in engineering colleges of Karnataka. COMEDK has exam centers all over India.

Uni-GAUGE is an engineering entrance test which is open for students all over India.