What do you call the previous version of a plane?
I am not sure if I am imagining things, but I feel like the word version isn't used at all to refer to previous versions of the planes.
I saw the word "variant" being used a lot, but I rarely see the word "version" and they rarely give the versions a name.
Is there a reason for it? What are the various ways to refer to the different "versions" of a plane?