Combining terrain only in overlapping areas

Hi, 

I'm working with Global Mapper v18.0. I'm trying ty apply the "combine terrain" tool in two ascii grid elevation layers through the gm command line. These layers do not completely overlap, and what I want is to obtain the difference between both layers only in the overlapped area (i want no information in non-overlapped regions). Doing this procedure manually (via global mapper tool box) i obtain exactly what i want. But doing it in a script I get the difference between my layers in the overlapped region, but I also get the elevation information in the non-overlapped region. Is there a way to obtain the differences between 2 layers only in the overlapped area using a script?

Thanks in advanced.

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