Here's a "stream-of-consciousness" style comparison of the two based on previous listens. Not trying at all to demean these episodes as IMO they're well written and well performed:

MAIN PLOTLINE:

GHOSTS OF YESTERDAY: An American woman who as a little girl was the lone survivor of a Belgian village flattened by the Nazis to set an example finds herself in the position of possibly confronting the commanding officer of that action, a man who may be her husband's future business partner.
MEMORY KILLERS: An American public relations executive, also a WWII USAF officer veteran who was shot down over Germany and imprisoned by the Nazis, semi-reluctantly takes a job helping a German automaker which is a client of his firm (can you say "Fahrvergnugen" (sic?)). While working for the family-run auto business he falls in love with a fraulein who is an executive with the firm, but comes to believe that her brother, also an exec, may have been the CO of the stockade in which he was imprisoned (and where many of his fellow officers died).

PLOT DEVELOPMENT:

GHOSTS OF YESTERDAY: We get the impending storyline telegraphed from the beginning (in a scene which reminds me a bit of the initial confrontation in the Dustin Hoffman movie Marathon Man, albeit with a survivor).
MEMORY KILLERS: Slow developing, but once the initial plot twist "hits" it gets progressively more interesting.

THE "GHOSTS"

GHOSTS OF YESTERDAY: Leon Janney, as another victim of the Nazis who alerts Teri Keane's character of the possible danger, says words which reverberate in her memory.
MEMORY KILLERS: Nat Polen, as a fellow officer who essentially dies in Bell's arms after being "all busted up inside" by Nazi torture, implores Bell to kill the Nazi CO to avenge his and their colleagues' death.

BEST LINES REPEATED AT LEAST TWICE IN A ROW:

GHOSTS OF YESTERDAY:

"Love you." (Russel Horton as the husband).
"Love you." (Teri Keane as the wife).

MEMORY KILLERS:

"Did I...ever...kill...anyone? Did I...ever...kill...anyone?" (Ralph Bell's character.)

BEST CBSRMT MUSIC BEDS:

GHOSTS OF YESTERDAY: Can't remember but I'm sure there were some...after all, this is the CBSRMT.
MEMORY KILLERS: The brass-dominated music bed which begins to be played immediately when Ralph Bell starts saying the words above. It seems to me I recall a similar such music bed in the always-excellent The Adventures Of Jonny Quest from the 60s. This is followed by a four-note, mysterious repeating score when Robert Dryden says the very same phrase.

CHARACTER DEVELOPMENT:

GHOSTS OF YESTERDAY: Ms. Keane plays a woman who sounds like a country club, bordering-on-prejudiced-against-those-beneath-her ( as the Nazis took to the extreme form) suburban wife married to an up and coming executive, and plays it well for a 1 hour radio drama, IMO.
MEMORY KILLERS: Mr. Bell adequately conveys an apparently middle-aged widower who visits Germany and is pleasantly surprised to find a thriving, post-reconstruction country which isn't "gray" anymore as it was after the war.

ARE THE ENDINGS DIFFERENT?

Think I'm gonna divulge that? ">) 