When I make a sweep with
cross with 20 Control points, Circle 12 Control Points = A
cross with 20 Control points, Circle 20 Control Points = B

A is slighty different of B despit of the fact that is the same Cross and Circle!
Just number of Control points are different for the circle!

I use Rebuild for give the same number of control points of the circle, (or any other figure)
I have build my cross for have just 2 control points for the straight lines!