What is the difference between models Marte and Giove?

Pop-up basket wastes Marte and Giove have the same design, but their basket plugs have a different configuration in open and closed position.

Models Marte and Giove are only available in pop-up version.
Mercurio 
Saturno, instead, are available in both pop-up and manual version thanks to an opening on the steel plate of the basket plug.