Other networks may have address formats that are identical to the ones on Avalanche. But that doesn't mean that you can send funds on Avalanche directly to other blockchain networks, including, for example, Ethereum or BSC (Binance Smart Chain). If you tell Avalanche to send funds to address (0x12345), for example, it will do so on Avalanche, not another network, even if that address exists or is valid on another network. Your funds will not end up on the other network. Once the funds are sent, only the person who has the private keys that control the destination address can ever access them. If you control the destination address, you can probably be able to retrieve them by importing the private key that controls the address to Metamask. If you sent them to someone else's address, though, you will need their cooperation, which may be difficult.