  We present a computational study of the pairwise interactions between defects
in the recently introduced non-reciprocal Cahn-Hilliard model. The evolution of
a defect pair exhibits dependence upon their corresponding topological charges,
initial separation, and the non-reciprocity coupling constant $\alpha$. We find
that the stability of isolated topologically neutral targets significantly
affects the pairwise defect interactions. At large separations, defect
interactions are negligible and a defect pair is stable. When positioned in
relatively close proximity, a pair of oppositely charged spirals or targets
merge to form a single target. At low $\alpha$, like-charged spirals form
rotating bound pairs, which are however torn apart by spontaneously formed
targets at high $\alpha$. Similar preference for charged or neutral solutions
is also seen for a spiral target pair where the spiral dominates at low
$\alpha$, but concedes to the target at large $\alpha$. Our work sheds light on
the complex phenomenology of non-reciprocal active matter systems when their
collective dynamics involves topological defects.
