The derivation of Cuban cigar leaf is murky. As recently as the early 20th century, all Cuban growers obtained their transplants from nurseries that paid little attention to seed purity and varietal differences. So every tobacco finca would end up with a mix of open-pollinated plants. Although growers recognized "good" plants when they matured, they simply sorted the tobacco leaf appropriately. (The genetics research of Mendel didn't really catch on until the early 20th century.)
ARS-GRIN obtained a number of seed accessions from the Vuelta Abajo in the first two decades of the 20th century. Each one is different. The "Vuelta Abajo" tobacco that I grow (the same one that BigBonner and Jitterbugdude grow) is an excellent one--a lucky selection. During the 1930s and 1940s individual growers developed their best selections, a famous one being developed on the Corojo plantation. Criollo was developed, I believe, in the 1950s, but I don't know its relationship (if any) to Corojo. Subsequent, numbered Corojo and Criollo varieties were developed in response to disease issues.
With the communist takeover of the industries in Cuba, and the smuggling of "Cuban" seed to Central America, Puerto Rico and the Dominican Republic, additional names proliferated. "Habano" leaf from Honduras and Nicaragua is, so far as I know, either Corojo or Criollo, since that was nearly all that was being grown in Cuba at the time. Judging entirely from the taste of the tobacco, I would guess that most Honduran Habano tobacco is Corojo.
Piloto Cubano was some Cuban seed variety (I don't know which) that was smuggled initially into the Dominican Republic. The taste of commercial Piloto Cubano is clearly different from either Corojo or Criollo, so heaven knows what it started out as. The Piloto Cubano that I am growing came from Puerto Rico.
And, I'm growing a Corojo from Honduras, and Corojo 99 from the Robaina plantation in the Vuelta Abajo.
The Corojo 99, Coroja (Cuban) and Criollo (Cuban) that I grew last year definitely differed from each other, and are different from the Vuelta Abajo. Based on the current appearance of the Piloto Cubano, it is yet a different leaf.
So, now that distinct varieties are properly bagged for self-pollination, maintaining their genetic purity, the obvious genetic drift of Cuban tobacco is surely a thing of the past.
Whew!
Bob