When BCH performed its last hard fork at 2018-11-15, BCH are split into BCH & BSV w/o replay protection. Therefore if you don't split your coins, BCH UTXOs created before #556766 are..
...valid on both chains, these coins are called unsplitted coins. The UTXOs(coins) created by unsplitted coins are still unsplitted coins, whose txs can be replaied on the other chain,
...unless you split these coins. Unsplitted coins create the same transaction IDs on both chain, but spitted coins are not.
