Ask and yea shall receive. Do a good job on this inventory and i'll mail you one nice free cambuca plant on behalf of all the greatful members here and future members, for the valuable work you are doing!
I don't know the answer to your question about whether there are different tasting cambucas or cambuca cultivars. But given the extensively mind blowing plant diversity and geneplasm in Brazil i wouldn't be surprised.
In the book by Silvestre Silva, Frutas Brasil Frutas, the author says that this tree used to be very common, but now is hardly found (in Brazil):
"Unless you are patient you will never eat the fruit of the cambuca tree that you planted. The tree may grow to a height of eight meters, but it grows very slowly and takes years to produce fruit. This may be the reason why the cambuca is more of a memory than a presence at the family table or in market stalls.
Native to the Atlantic Seaboard forests, and a distant relative of the jabuticaba, the cambuca used to be easily found in the Serra do Mar mountain range, and has been mentioned in the history of Rio de Janeiro life.
Sousa, the author of Noticias do Brasil remarked that the cambuca was "very sweet, with an honest flavour". This in 1587, when Brazilian fruits were virtually unknown. Ferrira Leal, in a book with the intriguing title of The Trials of a Husband describes the cambuca as being "tasty and innocent".
Those fortunate enought to find a cambuca tree may be able to determine what these authors meant when they called it "honest" and "innocent".
BTW, this book and other later editions by this author are very nice books, but hard to get. He is a professional photographer, and his books tend to be coffee table books, but not in any pejorative sense.
Oscar