Are these iterations of X-Com? I never got into anything beyond the first two.
No, these are space exploration sims/sand boxes more like Elite:Dangerous or Star Citizen. They predate both of those. This is the latest iteration.
I've mostly gone off simulators, but I have a soft spot for the X series of games. I have probably several hundred hours in them. Unfortunately the last game, X Rebirth, probably should have been called "X Stillbirth." They really made major changes that gutted a lot of what players loved about the game, and it really backfired on them. Looks like they're back to the winning formula.