This made me wonder: too much trouble for little gain. Why should the versions ever change? Well, obviously some bugs are fixed and some updates here and there but what's the difference really?
I mainly played Sierra games on the Amiga and then replayed some many times, other copies were bought, others were borrowed, others I saw on a friend's PC. However I don't remember any differences throughout the copies I played.
The current copy of CoC I have on the PC is the one downloaded from Marx's website and chances are that it has a different version number from the one I had on the Amiga. Even if it's so, I don't find the one better or more updated than the other.
So, I wonder if there is anywhere some "version history" about each of the games or even if anyone of you personally noticed some difference between two versions you happened to see

