It's the same ship in Prometheus and Covenant (David and Elizabeth Shaw escape in it at the end of Prometheus and land on the planet in Covenant, but it never leaves that planet) but yeah, it can get confusing especially because all the planets are named LV-(numbers)
There's also the ship that crashed near the end, in Prometheus. But after checking again, the environment is completely different than the 1979 Alien's planet (which is apparently close to the other one, and which already interested Weyland because of that transmission they caught, according to the lore).