in the following photos, i have vampire state building on my index (leftmost) and ring fingers and mrs. o'leary's bbq on my middle and pinky (rightmost) fingers. i did three coats of each polish, although mrs. o'leary's bbq (owner of one of my favorite polish abbreviations ever, "molbbq") only needs two if you let it dry a bit longer than i did.
vampire state building and mrs. o'leary's bbq have completely different undertones, and the difference between the polishes is visible in regular natural light. vampire state building's undertones are brown, while those of mrs. o'leary's bbq are purple. the two shades are closer on the nail than in the bottle, though.
vampire state building and opi a man in every port-ugal look closer in the bottle than vampire state building and mrs. o'leary's bbq do (leaving aside a man in every port-ugal's subtle shimmer); i'll comp them at some point.
here's a lighter (albeit slightly washed out) pic to better show the different tones of the two polishes:
btw, for those of you who are interested, i posted a full mani with molbbq here.