They're not that dissimilar, just the labels of what they've chosen to state of their status. Elite: Dangerous added planetary landing more or less around the same time Star Citizen did, for instance, but E:D called it an expansion and Star Citizen called it a new version for their alpha.
Also, you are confused Squadron 42, a single-player game, which has an alpha in 2020, and Star Citizen, which is more analogous to Elite: Dangerous, which is ongoingly available.