Sure, of course it's a different veg - doesn't stop the ignorant and uninitiated from calling "broccoli" (which is , indeed, as you describe it) "calabrese" - nor does it stop greengrocers (or the supermarket dumb version of that honorable trade) from labelling it so.

And, as to "pot" as a name, shona - I've not heard that used since mid-70s, I think. "Blow" was popular for a while, but I don't think it is now. I don't currently mix with anyone who is likely to inform me - life do get boring, don't it?