jm 'sbºgÝÏïÑ;i`Ê÷ûŬA¡üL£In theory, but big memos sometimes get confirmed on BCH. Transactions are broadcast to both chains but miners are pulling transactions from both mempools anyways.
https://whatsonchain.com/tx/d144d212ac7df5c8684a821e8b1fef3de5675f462b4522d53c591ab91c2d1208