It's not very different because an address is just a representation of a public key and they use the same type for public key.
If you search the code for `getUseForkId()` you will find some "ifs" for the protocol implementation, like special transactiom signing (for replay protection) or connecting to the right nodes. But there are not so many differences, as you said both projects look like a mirror -- You received this message because you are subscribed to the Google Groups "bitcoinj" group. To unsubscribe from this group and stop receiving emails from it, send an email to bitcoinj+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
