  Universal fractionalization of quantum transport characteristics in Majorana
quantum dot devices is expected to emerge for well separated Majorana bound
states. We show that the Majorana universality of the differential shot noise
$\partial S^>/\partial V$ and conductance $\partial I/\partial V$ at low bias
voltages $V$ arises only in ideal setups with only one Majorana mode entangled
with the quantum dot. In realistic devices, where both Majorana modes are
entangled with the quantum dot, $\partial S^>/\partial V$ and $\partial
I/\partial V$ become very sensitive to tunneling phases and their universal
fractional values are hard to observe even for well separated Majorana bound
states. In contrast, as revealed here, the ratio $(\partial S^>/\partial
V)/(\partial I/\partial V)$ weakly depends on the tunneling phases and is
fractional when the Majorana bound states are well separated or integer when
they significantly overlap. Importantly, for very large $V$ we demonstrate that
this ratio becomes fully independent of the tunneling phases and its universal
fractional Majorana value may be observed in state-of-the-art experiments.
