Hi, never look at Eaqrth Sculpture but have seen a dearth of others very similar and if they dont have direct export to 3ds, obj or fbx then look for a texture export format.
If they export as bmp, raw or similar then you can greyscale the skin if no raw is available and use that to generate a height map in Med.

Their may be some hieght difference but scale should fix that.

Hope it helps ...