So PBKFD2 is HMAC-SHA512 with two parameters :
1) password as "mnemonic sentence"
2) salt as "mnemonic sentence + passphrase".
PBKDF2 is not HMAC-SHA512 (in this case it uses it):
https://en.wikipedia.org/wiki/PBKDF2#Key_derivation_processHMAC-SHA512 with key="conduct coral enrich local script mountain remain fringe latin throw wood web", and salt="mnemonic"+00000001 gives the correct result.