This wonderful exhibition, from 7th October 2017 to 3rd January 2018 shows the similarities and differences between these two artistic friends.

https://www.royalacademy.org.uk/exhibition/dali-duchamp

Well known, such as ones based on the Mona Lisa, and also lesser known pieces are here. 

The King and Queen Surrounded by Swift Nudes, by Marcel Duchamp (1912), has cubist style king and queen, with electrons streaming around them, love and electricity holding them together. An incredible metaphorical image.