I must defer to MReyn..........obviously if the Shack MR3 flew some three years before the Argosy, I guess the wing was designed for the Shackleton - but at least the two aircraft types were correct !
Another similar story is that to speed up production of the Caravelle, Aerospatial bought the entire forward fuselage from DH and grafted the Comet nose onto their fuselage ?
(Please don't tell me DH bought a fuselage from Aerospatial and grafted their own fuselage onto the cockpit bit !!!!!)
But this is what A,H & N is all about, isn't it ?