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 :-
Hope it helps!
Wishing you All The Best!
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