The coloured blobs are what make the difference.
They are unique, not the moulded bit.
Like the Mdina moulded pots and textured bottles - the top parts are all hand finished and not to the same design specifications, so each piece is still unique.
(Quite apart from the colours.)
(Edited to add. Perhaps the folk sticking labels on were not quite as determined as I am to make a clear distinction between the two.
)