  We show that the idea of mapping between the Newtonian and Brownian
diffusivities proposed and tested on a class of particle systems interacting
via soft and ultra-soft potentials (IPL, Gaussian core, Hertzian, and effective
star-polymer) by Pond {\it et al}., [Soft Matter {\bf 7}, 9859 (2011)] is also
applicable to the Yukawa (screened Coulomb) interaction. Some of the
implications of this result with respect to self-diffusion in strongly coupled
complex (dusty) plasmas are discussed.
