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