Just to clarify the checklists in question on US Air 1549, the crew were actioning the dual eng fail checklist: 3-5 pages of relight and approach preparations The ditching sequence/preparation in this procedure is towards the very end of the procedure and the landing occurred before the ditching portion could be actioned.
The stand alone DITCHING checklist is a separate checklist and was not used by the crew as it assumes both Engines operating.