Differenses between Communism and Fascism

If you take that difference between fascism and communism to be on the franchise level. 

Communism is universalist and sees every worker (waged employee) as part of its franchise and claims to work for this socio-economic demographic no matter their ethnicity, its globalist. For every worker in the world.

Fascism instead sees its ethnicity as part of its franchise, it claims it works only for their people. Only for our people. You can make it civic fascism as well, only for citizens of the said country rather than ethnicity.

Fundamentally however they boil down to who they sacrifice for the benefit of their demographic. 

Communism first sacrificed all upper classes: rich, business owners, landlords, nobility. Later they went after overly well-off peasants (farmers), who were doing slightly better than their less fortunate neighbors. After they run out of well-off peasants, they went after real, but increasingly imaginative "enemies of the state". Any perceived disloyalty to the system could get you to concentration camp, Gulag, Pol Pot camps and the like. Sometimes there was not fault at all, just KGB needed to fill their quotas for the camps, so they just round up a random dude from the street and send him to Siberian Gulag. 

Fundamentally it became a system where absolutely nothing could guarantee your own security in face of Gulag and KGB. Not even friends in high places.

Fascism instead chooses to sacrifice people of different ethnicities. First there were Jews when they run out of Jews, they took Czechoslovakia, then invaded Poland, then other parts of Europe. All that was in search of sacrificial labor for their concentration camps. Nazis however refused to take from their own German ethnicity, with exception of political opponents of the regime and such. Thus gave them no option but invade other countries. Eventually they got defeated and it did not work for them. 

However Nazi system had a reasonable level of guarantee that so long as you are ethnic German, you will not be subjected to concentration camp. Unlike communism, where no one was safe from the reaper.