Wow! now i couldn't tell the difference even if you placed them side by side. from this link,
.:: Asiatic Green ::.:: Orchids :: Bulbophyllum
you can actually see differences between Bulbophyllum flabellumveneris (Thailand) and Bulbophyllum lepidum (Malaysia).
Bulbophyllum flabellumveneris seems to have a distinct '' V '' line going from its tip to the sides of the flower which is also seen in Pheli's picture in the first post.
Just sharing my thoughts,
Cheers,
Freddie