  It is shown that the canonical quantization of the free massive Kalb-Ramond
and Curtright-Freund Lagrangians leads to the same theory obtained from the
canonical quantization of the free Proca and Klein-Gordon Lagrangians. The
duality in the presence of interaction is explored in the context of the
Feynman rules and beyond. It is pointed out that the equivalence between
massive dual models without gauge symmetry is rooted in an ambiguity of
coordinate choices.
