  We compare fully differential exact results for the virtual photon correction
to single hard photon bremsstrahlung obtained using independent calculations,
both for electron-positron annihilation at high-energy colliders and for
radiative return applications. The results are compared using Monte Carlo
evaluations of the matrix elements as well as by direct analytical evaluation
of certain critical limits. Special attention is given to the issues of
numerical stability and the treatment of finite-mass corrections. It is found
that agreement on the order of 10^{-5} or better is obtained over most of the
range of hard photon energies, at CMS energies relevant to both high energy
collisions and radiative return experiments.
