can I bond edges surfaces from rhino in maxsurf?

hi all,
since i'm still learning about using rhino, i found some problem in the modelling.
one of them is, my surfaces that were joined well in rhino are unjoined when I open in maxsurf (the iges file).
when I try to join them with command bond edges, it's said that the surfaces have different knot vectors (something like that), although they have same stiffness and number of control point.
so, can anyone help me?


thanks..