Split surfaces according to curves on same plane

 Hi,

I've experienced a problem splitting all the surfaces of a cell( coming from a voronoi subdivision).

Basically from the voronoi 3d I get some polysurfaces, then after a procedure of scaling faces and volumes,I create a mesh and a Catmull-Clark subd;from that point I found the intersections between this mesh( converted into a brep) and the inital brep( from the voronoi).

These intersection become surfaces and now I'm trying to divide the surfaces of the cells according to the surfaces from the intersections.

I've tried to sort the two list of surfaces in order to make the solid difference work but this seems pretty engaging ( no good result for any of these discriminant: area value ,  plane direction  or distance between central point of the surfaces).