Maya Modeling :: Mudbox Blend Shape Subdivision Woes

I have run into an issue relating to the differences in the way Mudbox and Maya subdivide meshes. My workflow for creating blend shapes is as follows:

1. Create base head mesh in Maya
2. Import base head mesh into Mudbox and subdivide to level 2
3. Create a Mudbox layer on top of base head mesh to sculpt each blend shape (e.g., browsMidUp)
4. For each blend shape, export the level 0 mesh to Maya for use as a blend shape on the base head mesh

Here is where it all falls apart.

When I smooth the blend shape in Maya (either by choosing smooth preview or by selecting Mesh>Smooth), the smoothed mesh in Maya differs from that in Mudbox. In the case of browsMidUp, the blend shape created in Mudbox only modified the brows. However, in Maya when the blend shape is smoothed the mouth opens up (i.e., the lips smooth differently in Maya than Mudbox, causing the mouth to open).

This is incredibly frustrating because I did not discover this problem until after I created approximately 35 blend shapes in Mudbox!I believe I can work around my current error. However, I would like to know how others approach the creation of blend shapes.Do you use Mudbox? If so, how do prevent issues associated with smoothing differences?