El_monty on Nostr: doing something dumb... Anyone any clue why the following python code isn't coming ...

doing something dumb... Anyone any clue why the following python code isn't coming out to match the keys as NIP44 at https://github.com/paulmillr/nip44/blob/main/nip44.vectors.json

from cryptography.hazmat.primitives.hashes import SHA256
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
import secp256k1


def get_conversion_key(priv_k:str, pub_k:str):

the_priv: secp256k1.PrivateKey = secp256k1.PrivateKey(privkey=bytes.fromhex(priv_k))
print(f'using priv: {the_priv.private_key.hex()}')

the_pub: secp256k1.PublicKey = secp256k1.PublicKey(pubkey=bytes.fromhex('02'+pub_k), raw=True)
print(f'using pub_k: {the_pub.serialize().hex()}')

tweaked_key: secp256k1.PublicKey = the_pub.tweak_mul(the_priv.private_key)

print(f'tweaked {tweaked_key.serialize().hex()}')

h = HKDF(algorithm=SHA256(),
length=32,
salt=b'nip44-v2',
info=None)

con_key = h.derive(key_material=tweaked_key.serialize()[1:])
print(f'conversion k: {con_key.hex()}')

get_conversion_key(priv_k='315e59ff51cb9209768cf7da80791ddcaae56ac9775eb25b6dee1234bc5d2268',
pub_k='c2f9d9948dc8c7c38321e4b85c8558872eafa0641cd269db76848a6073e69133')