On the PAUL LECAT, the well decks begin just at both ends of accomodations. On the unknown ship, we find a small deck (15/20 m long) aft and forward the main accomodations.
The unknown ship seems not completed; life boats are missing. I wonder this photo was taken a few time after launching ?
SPHINX was either launched very incomplete and brought in a dry dock for further compeltion or built in the dry dock:
Furthermore she didn't have an extended deck at the rear end of the accomodations.
But ATHOS had, and she was launched in the state pictured: