The beige labeled square bottles are 82 Euros on the Serge Lutens site, while the black label comes at 99 Euros. Other than price, it was once stated that the black labeled ones were 'haute concentration', so contained more perfume oil. Whether that still applies, I don't know. Anyway, there is nothing to choose from. The perfumes come as either beige or black label.
One thing I do not understand though why e.g. Chergui can be had as beige label in the former Export collection plus as exclusive bell jar.