New Guy, quick question

[The Real Rake]

Hello Everyone, I registered today after I watched a Youtube by Idjester on Antietam.  The ACW Tiller gaming system looks incredible.  I wanted to buy and invest my time in the Gettysburg Campaign.  

In Idjester's Youtube video (Civil War Battles ANTIETAM John Tiller Software Let's Look At this Game Scenarios, Counters, Maps - YouTube) at 45:51 he is reading "notes.pdf" file within Antietam.  It lists a bunch of changes that appear to be the way things should be.  

That video is over 2 years old and at that time, GBurg did not share in any of these "new updates."  I just checked the Tiller site and I see the MAP UPDATES now exist for GBurg, which they did not when this video was made.  My question is, do the changes in the Antietam "notes.pdf" document from 2 years ago now carry over into the Gettysburg Campaign rule set?  I was hoping they did.  If they did not, I will buy Antietam.

Are there any rules differences between Antietam and GBurg, or all Tiller ACW have the same rules? 

I want to spend some solo time with AI before looking for PBEM.  While playing against AI, I was wondering if PBEM people use 'Extreme FOW' in PBEM?  Until I start playing, I am not 100% sure I understand all of it, but that sounds like that option is a drastic change to the game.  To me (with zero experience), it sounds like this would be the best way to play.  But if PBEM people do not use it, I guess I will not practice with it.  Any info or comments on 'Extreme FOW' play is greatly appreciated.

Thank you again for allowing me to be a member of this forum.

I believe all games in the series have been updated to the same level.  All games use a common rule set and the user's manual has been recently updated (all gam in the series use a common manual).  All have been converted to use the hand painted maps.
 
I had had a couple of games in the series for quite a few years (G'burg & Antietam), but only recently began playing beyond the "Started" scenarios.  I have mostly gamed against the AI for much of my gaming career, but I found the ACW AI lacking, more so than most.  I joined the ACWGC just to find some competition; take a look at the site if you wish:
 
http://www.wargame.ch/wc/acw/


Rarely having played PBEM, I've found the club to be a great place to learn more about the game and they seem to be a great bunch of guys.  There are still a few things that I'm trying to learn about this great series (I now own all but 3 of the games), but joining the club has certainly expedited my knowledge.

Regarding EFOW, most in the club seem not to use it.  Myself, I am a proponent of its use, mainly because I don't think too many regiments had RQ-11's in the early 1860's.  When EFOW first came out (in other games), I hated it.  But over time, I've learned to enjoy it and it's made me study the map more thoroughly.