Indeed, they cover different things.
The main feedback I got from Datavis 2020 is that folks want to learn how to do those same things, but without React, for whatever reason. I get that, and did the Get it Right series with no React.
I hope to do a future course that is a combination of the two, where the first half covers visualizations purely with D3, and the second half covers how to leverage those pure D3 implementations within a React context, leveraging React mainly for state management and its component infrastructure.
will the Get it Right in Black & White provide all the necessary learnings?
That depends - necessary for what? There is some overlap between the two, but there are also substantive differences. I’d recommend the Get it Right series over Datavis 2020, mainly because it’s newer and the Datavis 2020 content is getting a bit dated.