As nouns the difference between cerise and magenta

is that cerise is a deep, bright red colour tinted with pink while magenta is a light purple, purplish-red, or pinkish purple colour obtained by mixing red and blue light (thus a secondary colour), but primary in the CMYK colour system used in printing.

As adjectives the difference between cerise and magenta

is that cerise is cherry-colored; a light bright red; -- applied to textile fabrics, especially silk while magenta is having the colour of fuchsia, fuchsine, light purple.

As a proper noun Magenta is

a town in Northern Italy, site of the Battle of Magenta after which the color magenta was named.