I understand it has been a few years since this forum has been active, but can anyone tell me if there is anything significant between the knives that have the Randall blade mark etched and those that are stamped?

Welcome to the forums.
These are still very active.
This particular thread has not been too busy as you can tell by the last posting date.
If you post your question in the general Randall Made Knives topic, you will get an answer quickly.
I am not a moderator, so I do not have the ability to move your question into the broad category.
Mitchell Harrison, tunefink, posted a method of searching the forums using google
https://www.knifetalkforums.com/ubbthreads.php?ubb=showflat&Number=122768#Post122768

The practice is not used, nearly as much as in decades past. The "Solingen" blades were often etched because they came, heat-treated, and stamping then was not practical.
Other "etching examples came from the hammer-stamped trademark being "lost" in the knife-making process. At times they (the blades) were stamped too lightly or when the blade was not as "hot", if you will, resulting in a light stamp. At other times, in the process of grinding, buffing, etc. the stamped trademark would not be properly legible...hence etching.
I am positive there are numerous "more" examples but this (hopefully) gives you a little background on etching. The blades being put out today, at least from the numerous blades I handle, almost always have a good, easy-to-read stamped Randall trademark.
Hope this helps,,,and Stay Sharp,
Capt. Chris