I too, routinely refer to both as "Canadian Geese", although I'm also routinely corrected by my SO. Canada geese have the same markings but have a slightly shorter, more blunt beak, and are generally smaller, than Canada geese, e.g. the Canadian drakes are about the size of Canada geese females.
No shame in calling both whichever you wish. 99.9% of the population do, and no-one will complain. Certainly not me.
Although we do enjoy a very small number of them, whether they're Canada geese or Canadian geese I personally don't know, I agree with the others that TOO MANY, are not welcome. Nor are year-round residents. We enjoy learning their habits and quirks, as we do with all other wildlife that we have around here. But they're not welcome to set up permanent residence... not unless they are willing to pay their share of the taxes.