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Tangent means having colinear radii where the curves join, or C2 curvature. Equal curvature means having colinear radii of equal length where the curves join, or C3 curvature.
Mark B. did presentation about this at sw world 2007.
If you came to sww 2007, you should have the document.
To get tangency, control select the spline and the surface.
For Equal Curvature, control select the spline, the surface and the edge of the surface.