Tangency vs Equal Curvature

I have been having issues creating two point splines betweenaseries of offset surfaces - complex blends using3Dsketches. When constraining the splines I have noticedthatsometimes I get a tangency constraint and sometimes I get anequalcurvature constraint or both. Can anyone tell me whatSolidworksrequires to obtain an equal curvature constraint vs justa tangencyconstraint. Thanks in advance to anyone that can solvethisproblem.SolidworksSketching