The fascinating aspect of Che Guevara being lionized as a revolutionary hero in Cuba, he was an Argentinian, not a Cuban. It was also very apparent in Cuba in the early 1960's that his head was getting a bit big, and two big heads(the other being Castro) cannot last long in a dictatorship, so one had to go, and Ernesto was the one. He was sent to Latin America by Castro to foment revolution in Bolivia, where he was killed by CIA operatives, but all the better. Now he was out of Castro's hair, becomes a martyr for revolution and was killed by operatives of los Yanquis.
So Ernesto being the martyr for the cause has his mug on this coin and the 3 Pesos banknote, but all you see of Fidel is his small mug on the reverse of the 1 Peso bill showing his entry into Habana in January 1959.