There’s different types of a mustard plant, they’re all mustard plants put through different cultivation methods to prioritize certain features or elements. The same be said of any Bitcoin fork, it might not look like the original but it still comes from the same source code. Henceforth, at one time before the code was cultivated it would have been Bitcoin but now it’s a different variation of Bitcoin.

You're trying to draw a parallel between plants and currencies. It doesn't work like that, but I've already said more than enough. Best of luck

A fork is if you took the mustard plant and genetically engineered it until it turned into a dung beetle. In my opinion, the dung beetle is not mustard.