I'm not super familiar with which op codes are currently available; is the use of OP_RETURN in Vapor consistent across Bitcoin SV, Bitcoin and Bitcoin Cash? E.

I'm not super familiar with which op codes are currently available; is the use of OP_RETURN in Vapor consistent across Bitcoin SV, Bitcoin and Bitcoin Cash? E.g., could I timestamp something on Bitcoin, or will timestamping/monetizing only work for Bitcoin SV?