I suspect that, after more than a year, you may have found the panels you're looking for. But in any case, I just took a deep dive into my Commemorative Panels from the early 1980s. I was unable to find the MLK portrait you posted. I suspect it may have been engraved for the MLK panel but was not used.
As for the Olympic Runner, I think that one may have been mis-titled. There are two 1984 Olympic panels with what looks like Baratz's work. Both have athletes that appear to be running, at first glance. One is a soccer player on CP-192, the other is a discus thrower on CP-195. Hopefully this is helpful.