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Not obvious because some step drives list the microstep ratio:
2,4,5,8,16,32 etc but some list steps per revolution, 400,800,1000,1600 etc

OK, i have to ask, why FreeCAD after Inkscape?
If you are trying to do a depth map, none of those are good choices, try dmap2gcode from ScorchWorks website, it is very easy to use and works perfectly.
That is derived from the already included image2gcode that comes with LinuxCNC, so did you ever try to open a image file with LinuxCNC ? It works fine, but does require a bit more testing to get good results.