Sanji's faster, his flammes are hotter
And he has a durability around the same level as that of king's once his flammes are off
Sanji is around the same lvl, maybe a little bit higher
Sanji without his maximum speed couldn't avoid getting tagged by Queen, multiple times, so hell no.
With his maximum speed, nothing proofs he is faster, and sure it's not having the benefit of the doubt in a comparison with a massively stronger character. Not to mention that Sanji can hold his maximum speed only for a brief period of time, after that he is exhausted.
Same durability? Don't be ridicolous.
Sanji tanked a hakiless nameless sword attack by someone who isn't even a swordsman.
King easily tanked Zoro's Tatsumaki, the same attack that cut through Kaido's scales and made him vomit blood from the inside and overpowered his tornados and had Big Mom impressed.
King is so much stronger than Sanji.
And it's literally a far better version than he is.
Sanji has fire and physical strength, King has better fire and is physical stronger.
Sanji is fast, King is as fast if not most likely faster, plus he doesn't exhaust quickly like Sanji does.
Sanji is tough, King is tougher and can somewhat nullify attacks that would kill Sanji ten times (like a Post TS upgraded Shishi Sonson).