2 polishes that look very much alike in the bottle.. but do they on the nail? The answer is no. They are pretty close though and I think depending on the accessibility you shouldn't have to get both. Catrice applied easier and needed only 2 coats, Models Own needed 3.
Middle finger is Catrice I Sea You, others are Models Own Slate Green. Catrice is greener and sort of brighter while Models Own is a bit lighter and more muted.