Hair Thickness vs Density in a Hair Transplant

When estimating the number of grafts a person needs, I always want to know the hair thickness of the person. The reasons for this are clearly defined by this graphic I saw on Reddit.  For a visual representation, the graphic artist kept the number of hairs the same (density) and change the thickness of the hair so show the difference in coverage.  This was nicely discussed by Dr. Sharon Keene with actual hairs.  So you see, that if your hair is fine, it will take a lot more hair to get the fullness that a person with a medium weight hair or a coarse hair.  This is why, people with fine hair often get a second hair transplant because the fullness seen is not as good as if the hair shafts were thicker. It is therefore true that that two fine thickness hair transplants with the same number of hairs might be equal to one medium thickness hair transplant.   Then it is also true that two medium thickness hair transplants with the same number of hairs might be equal to one coarse hair transplant.