  Employing time-dependent density-functional theory, we have studied dynamical
equilibration and binary head-on collisions of quantum droplets made of a
$^{39}$K-$^{39}$K Bose mixture. The phase space of collision outcomes is
extensively explored by performing fully three-dimensional calculations with
effective single-component QMC based and two-components LHY-corrected
mean-field functionals. We exhaustively explored the important effect -- not
considered in previous studies -- of the initial population ratio deviating
from the optimal mean-field value $N_2/N_1 = \sqrt{a_{11} / a_{22}}$. Both
stationary and dynamical calculations with an initial non-optimal concentration
ratio display good agreement with experiments. Calculations including
three-body losses acting only on the $\left|F, m_{F}\right\rangle=|1,0\rangle$
state show dramatic differences with those obtained with the three-body term
acting on the total density.
