Yes it is possible to rollback the token from bep-20 to erc-20 as it will be the same wallet and if supported by the exchange you will definitely get it back however many exchanges have a rule that if you send wrong wallet address or use wrong bep-20 or erc -20 it will be lost forever, i used to trade and exchange does not support bep -20 and i lost that amount forever mine, especially this we have to be very careful if we don't read it carefully it will be very easy to lose money and very difficult to get it back.