  A novel method to differentiate the effects of Dirac and Majorana (D-M)
neutrinos in four-body decays has been discussed in arXiv:2106.11785. There, it
is concluded that the back-to-back kinematic scenario seems to avoid the
constraint imposed by the "practical Dirac-Majorana confusion theorem", as one
does not need to fully integrate over neutrino and antineutrino momenta. In
this paper, we propose to analyse radiative leptonic lepton-decays
($\ell\to\ell'\nu\bar{\nu}\gamma$), as an independent alternative process to
study the possible Majorana nature of neutrinos. Our approach demonstrates
that, in the back-to-back kinematic configuration (for the $\ell'- \gamma$ and
$\nu-\bar{\nu}$ systems, respectively), the distinction between Dirac and
Majorana cases disappears when the inaccessible neutrino angle is integrated
out, which might appear unexpected considering the claims in arXiv:2106.11785.
Our results apply in absence of non-standard interactions, which can enhance
generally the sensitivity to the neutrino nature.
