Samourai uses a modified fork in order to support their features i.e. paynyms, bip47, whatever else, the only one available was last updated 6 years ago on the old repo:
then ashigaru is using a pre-compiled binary of that fork
GitHub
GitHub - Samourai-Wallet/bitcoinj: BitcoinJ: Samourai Wallet and Sentinel
BitcoinJ: Samourai Wallet and Sentinel. Contribute to Samourai-Wallet/bitcoinj development by creating an account on GitHub.