Back in the day, over a decade or so, I wrote a few megabytes of VAX Basic. The language, and the code I wrote, at the end of that period looke nothing like it

Back in the day, over a decade or so, I wrote a few megabytes of VAX Basic. The language, and the code I wrote, at the end of that period looke nothing like it did at the beginning. So yes, it’s quite likely that the Basics are substantially different.