And if either of them was ever run in North Ametica there is a big hole in the BBC's paperwork.
Not impossible: Sierra Leone ran season three without paying to do around 1990, from prints they'd had since the '70s. But by the time this lead was spotted they'd been destroyed by the civil war.
So there is a tiny chance that 'audition prints' were sent to the US and run unoffically. But it's a bit of a stretch...
I have a friend who says that she saw "The Wheel in Space" in Atlanta in the early 1970s. And I've heard rumors that it was broadcast elsewhere in the US (Washington, DC, specifically) at roughly the same time. I find it difficult to discount my friend's first-hand account. If there's a black & white era
Doctor Who story that got passed around PBS stations circa 1972 and broadcast, I'd put my money on "Wheel."