State Government
(1) No person can be a member of both Houses of a state's Legislature - the state Legislature provides by law for vacating one seat. (2) No person can be a member of two or more States' Legislatures simultaneously; if elected to more than one, their seat in all but one becomes vacant after a prescribed period unless they resign the others first. (3) A seat becomes vacant if a member becomes disqualified under Article 191, or resigns in writing and it's accepted (and genuinely voluntary). (4) A member absent from all meetings for 60 days without permission may have their seat declared vacant.
This mirrors Article 101 (Parliament seat vacation) at the state level - an MLA/MLC cannot simultaneously hold seats in two Houses of the same state's Legislature, or in two different states' Legislatures at once.
If someone is elected as an MLA in one state and also somehow elected to another state's Legislature, they would need to resign one of the two positions - holding both simultaneously isn't permitted.