Capsicum chinense is a species of chile. I've read in multiple sources that some botanists consider Capsicum chinense to be part of Capsicum annuum, but I've never heard nor read material from anyone who feels that way personally. Basically, a Habanero is a variety of chinense. All Habaneros are chinense, but not all chinense are Habaneros. Someone mentioned that a lot of chile nomenclature is regional, and that is true. Weird thing about it is, Habaneros aren't popular in Havana and, from what I understand, they never were.
A lot of folks have abreast pointed out that there is basically a habanero type, and that these types are most often called different names on different areas of the world. As far as I can tell, el Mundo Hispanico and the USA refers to these things as Habaneros, whereas the Caribbean tends to call Hab types "Congo," even though they aren't from the Congo. Generally speaking, the "Congos" trend to be bigger than the Habs, but there are plenty of huge Habaneros, and there may be some dinky Confidential, although I cannot think of any.
From what I've read on some old works seed vendors' sites, such as semillas.de, it seems like some of the African Hab tours are often referred to as Scotch Bonnets.
To me, "Habaneros" are chinense peppers on that whole 200k - 550k shu range, and they tend to be of a general shape and size, of course with a lot of variation. It's tough to categorize and argue, but once you get the basic idea, you'll know it when you see it/taste it. In the case of the JHC, there are enough discussions here on THP and elsewhere on the interwebs about the minor distinctions between the Jamaican Hott Chocolates and Chocolate Habaneros that I can say that they are very similar. Bc I'm a bit pedantic, I would call the JHC a Hab-type rather than a Habanero, but virtually every time I tried to explain them to a fellow lover of delicious peppers, I end up saying they are "really good chocolate Habs, basically."
Not sure all this bloviating helped you at all but I know that I, for one, feel a lot better now. Thanks.
Ps- if you're looking to grow one of these, the JHC is a rad chile. They are obnoxiously productive plants, sure to make you feel like a champion grower even if you don't deserve it.
Ps2-alot of Hab-types are crazy productive like that, though.