HELLO!

Definitely you can apply for BTech course in Maharashtra with 12th marksheet from Karnataka.

For getting admission in BTech course what matters is the score of your entrance exams in JEE Mains and Advanced. Since you are applying for Maharashtra, you may attempt MHT CET for your course.

There are few eligibility criteria for getting admission in  BTech in Maharashtra :-

• You must have minimum 45% marks in class 12th.
• You must have Physics, Chemistry, Biology and Mathematics as mandatory subjects in Class 12th.
• You should clear entrance exams like JEE Or MHT CET.

Hope it helps!

Wishing you All The Best!