Hello Student

If you want to change your board from Gujarat board to Maharashtra Board after class 11 is not possible. As a rules of Higher  Education Department of Government of India student can take admission only after class 10 completion in class 11. No student is eligible to change his board on or after of completion of class 11 . As you want to change your board from Gujarat board to Maharashtra Board then you have to take admission again in the changed board in the class 11 after passing class 10 examination.

Hope this helps.