translation of the Latin - leucochilum = white lip
Paph leuchochilum is the one with NO SPOTS on the pouch, it can be white or cream or pale yellow.
Paph godefroyae has some spots on the pouch. Again, it can be white, cream or pale yellow.
As far as I know, that is the ony trait that separates the two, most consider luecochilum to be a variety of godefroyae as it is only color that distinguishes it from godefroyae. Where these two taxa do have other differences that separate them from the other brachys, like bellatulum, niveum and concolor.