I think forces obtained from two different approaches shouldn't be the same.
Indenter-target interactions in two approaches are quite different.
In all-atom approach, the interaction is dominated by the non-bonded
interaction (like vdW) force if there is initial
gap between the indenter-target pair. Whereas in the imaginary indenter
approach, you can change the interaction intensity
just by changing the K value. How do you know that the K values that you are
using is properly representing the vdW interaction?
If I were you, I would prefer all-atom approach (i.e.,diamond indenter).
University of Delaware.