most of the "drag" of the widebody is simply the perceived slower flight - typically flown out a bit further and thus looks slower .
I doubt anyone has a definitive drag test which shows drag relationship of fuselage shape OR area .
In the sizes we are working with - the real drag increases are done using induced drag -- prop / larger wing area etc..
On a full size airframe -this is really easy to see and full scale racers work on squeezing out parasitic drag.
models of 1100 sq inches - an entirely different matter.