Nope...... You will need to send them a pdf of the drawing and save out the sldprt/sldasm files as step, iges or parasolid. He will get dumb solids with no feature tree. If you save a parasolid be sure to check the options tab and save out an earlier version of parasolid. The latest version of parasolid will not open in SW2008.
If your client has FeatureWorks he may be able to run that to get a feature tree. It is not an automatic, bullet proof solution, especially if the parts are complex.
If the changes are just at the 2D drawing level, you could use DXF or DWG, but the drawings would not be associative to the model.