It is really close. Amazing find. Is the woman's dress different though and the shoulder drape to the left on the drawing and to the right on the Jobling?
It's hard to check the exact details as I don't have the Jobling piece in front of me. Each figure on the Jobling piece is slightly different and has a different position/features (posture, head tilt, arm position, etc.). Regarding the dress, it looks the same to me as far as I can see in terms of the overall shape and how the creases are handled. The diagonal fall of the fabric at the knee is also the same, as are the folds to the rear towards the lower portion of the column, though the exact details do differ figure-to-figure.
I'm now debating whether to buy the drawing -- there's also another in the seller's items which matches a pre-1937 Verlys pattern, which again if genuine, would confirm my suspicions that d'Avesn designed for Verlys before his official employment there.
Given how prolific d'Avesn appears to be, as well as his documented work for numerous glassworks, it may not be such a big surprise that he may have designed for Jobling as well. However, I'd never have suspected the three graces comport as a d'Avesn design: however, I've always thought the B2 Fish Vase, especially the handling of the stylised waves/ripples, has a very d'Avesn look.