  We demonstrate that supersymmetric decays, as typified by the predictions of
several GUT-scale boundary condition choices, do not prevent detection of $Z^*
\to H^0A^0,H^+H^-$, at a $1-4$ TeV $e^+e^-$ or $\mu^+\mu^-$ collider operating
at anticipated luminosity. For much of parameter space the relative branching
ratios for various SUSY and non-SUSY decays can be measured with sufficient
accuracy that different GUT-scale boundary condition choices can be
distinguished from one another at a very high confidence level.
