differences in each version of doom.

[signofzeta]

I have ultimate doom and saw that the red key in containment area is behind a blue door.

I went to australia and played v1.1 of doom at somebody's house. There, the red key is behind a normal door that only can be opened via a switch behind the other blue door where you exit from when you got the blue key.

Another one I know is the switch in hangar where the armor is at the right pillar that opens ouside to blue armor in ultimate doom, but does not have that in older versions.

Is there any other differences between each version and where are those differences?

[Illdo]

The only other changes to the game itself are the addition of a few passages in E1M1: Hangar and a secret switch in E1M8

Taken from the Doom Wiki. (doom.wikicities.com) This explains everything, I hope.

[Grazza]

You may find this interesting:
http://rome.ro/lee_killough/versions/index.html

[ultimatesaiyan605]

Yep, one is the original and the other is V1.1 :D