Boeing of course used the wings from its bombers on various of it airliners with considerable success.
The B.314 boats used the wings and cockpit section of the XB-15 but of course upgraded to R-2600 engines.
The Boeing 307 used the wings and empannage from the B-17 and in fact near wars end some of them swapped out the wings with those from the B-17G model. One difference though, the B307 wings were fitted with fixed slots outboard due to the crash of the prototype during a demonstration flight for KLM.
The B377 Stratocruiser used the B-29 wing and engines in the prototype and then upgraded to the B-50 configuration.