Two different two-loop relations between the pole- and the
MS-mass of the top quark have been derived in the literature
which were based on different treatments of the tadpole
diagrams. In addition, the limit M_W^2/m_t^2 \to 0 was employed in one
of the calculations. It is shown that, after appropriate
transformations, the results of the two calculations are in perfect
agreement. Furthermore we demonstrate that the inclusion of the
non-vanishing mass of the W-boson leads to small modifications only.
