Those first two stories are more likely to be Marvin Stein. With different inkers. If you look at the panel here you'll see that his work is very similar to Buscema's.
https://www.lambiek.net/artists/s/stein_marvin.htm
I think his work is familiar to me from the Gold Key Twilight Zones.
Edit. Ok I'm happy to eat crow.
According to this Buscema was on staff at Ziff-Davis, so it may well have been him.
https://broom02.revolvy.com/main/index.php?s=Ziff-Davis%20Comics&item_type=topic&nojs=1
Link to the book:
Crusader from Mars 2