The difference will be mostly in the complication of building. As for
performance there could be a bit of additional drag due to increased
wetted surface. It depends on how wide the dory bottom is. Fishing dories
had very narrow bottoms which made them quite tender. It would make no
difference to have a "V" bottom. "Batteau" dories were more like barges
with wide bottoms and low sides. What makes a boat a dory is basically the
way a large board is bent 'round a middle form on a flat bottom. Raking
the sides out is what gives the bottom rocker. The side boards are usually
shaved down at the lower ends to reduce the rocker. The computer program
you are using calculates wetted surface. It can also do the (hydrostatic)
calculations for different angles of heel but one assumes a rowboat is not
heeled as that makes rowing uncomfortable.

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