The BOAC ones were the B-377 Stratocruiser, similar in appearance but a distinctly different civilian airliner, with notably different internal systems.
The 1987 accident at Mexico City was one of the Haiti-registered Miami-based ones. I recall a Boeing statement the day after the accident that "We didn't know any were still being used". Since, despite the country of registration, they actually operated from a major US airport alongside its principal runway, and were a notable sight to all and well known to enthusiasts and featured in publications, this did not say a lot for Boeing's record keeping. I went through there a couple of times in the early 1990s and they were still there, but never saw one move.