No. In clip shows such as 'The Voice of Reason' and 'Final Appeal', we see the characters discuss events that occurred in several separate episodes with no apparent link to one another, therefore we must assume that those Outer Limits stories occur in the same narrative. However, there are other episodes that have contradictory conclusions for the human race, so those episodes belong to a different reality.
'Tribunal', 'Gettysburg', and 'Time to Time' are episodes that belong to yet another reality, in which there is a Time Travel Institute in the future that uses time travel to fix problems in the past; a similar example can be found in Star Trek: Voyager, with varying time travel institutions in the 29th century (episode 'Future's End') and other episodes like 'Relativity' and the one in the 31st century in several episodes of Star Trek: Enterprise.
