You could be right, that's for sure. McCartney played lead on a good number of songs that I was unaware of when growing up as a Beatles fan. I always thought: "geez, Harrison sure varies his style a lot." Taxman comes to mind. That lead is pure McCartney. George was a bit hacked off by that, as I recall from Anthology.
But I'm pretty sure that's a 12-string on Ticket to Ride, and I've never heard of McCartney using the 12-string. Then again, I've never heard of Charles Manson knitting a sweater, but it's possible he has. Of course, it would have a backwards swastika on it, but I digress.