These photos show the 2 side of A350 flightline, there is 4 QR at the flight line? MSN21 (came back from delivery center?) + MSN 25, 33 and 36 (new roll out?)
For SQ as MSN 31 and 37 (new roll out too, see a380.boards.net/post/72098 ) To Finish there is CX MSN29 an AY MSN28. MSN35 (JJ3) doesn't appear on the photos, maybe it was moved to the delivery center?
All this assumption are made on the basis that none aircraft was moved between the 2 photos!