For wine and cheese, for example, there are laws that stipulate that what is listed on the label listed be consistent with where and how the product was made. With wine, the grapes MUST have been a particular variety and grown in a particular place.
No such regulation exists for pipe tobacco, and furthermore industry records demonstrate a three-quarter century's long pattern of substituting ingredients for earlier ones for reasons of economics and unavailability.
Now, where Yenidje is concerned, ask yourself: who gets to decide that a tobacco is called Yenidje? Is it a place? And is the "new" Yenidje guaranteed to have come from there? It's also likely a specific variety of tobacco. Was genetic testing done, as is done with wine grapes, to ensure the strain is correct?
To a point, it's overthinking the matter, especially if you enjoy the tobacco and it's similar enough to your memories of it, but let's just say that with certain industries, ingredients are more of an advertising term than a matter of hard science.