The very basic balluster form of the amethyst and green vases here can be seen from many makers worldwide, over many decades.
Despite the subject matter, silver decoration and banding is more often associated with Bohemian-Czech makers. It's well known that not all glass sold in Venice originated on Murano or even Italy. The colours of the two silvered vases also strike me as more likely Czech than Italian and the Czechs are noted for decorating pieces "in the style of" specifically to suit those export markets. Examples of this have been known to date back well over 100 years and on more modern (70's) pieces, I had a piece of Sklo Union decorated in gold as a souvenir of Norway. I don't think there's any relationship to the Empoli piece.