Gubar in the convertion options using control points should give you exactly the same poly mesh as the nurbs surface.
You might want to rebiuld the nurbs first to have less isoparms around the circumference as a nurbs circle has quite a lot or simply reduce the points in the circle befor the extrude.
You might also find the amount of isoparms spaced along the surface may not be enough to give a a very smooth bend when converted to poly but you can either change that before you convert to poly or add edge loops after and tweek the polygons into shape.