EPT combat tables are almost identical with those in OD&D. There are four d-20 based Saving Throws. Most weapons deal d6 damage. Magic-Users are allowed to wear Leather Armor. In published version of the game you roll for initiative ("reaction time") in Combat. There are double damage and instant death rules. Damage Dice table is really awesome, I added it to my OD&D campaign (works perfectly). Skills system resembles secondary skills from AD&D. HD progression is a little different, for example 2nd level Priest has HD 1+3. Like Derv has already mentioned, characteristics are percentile, which I guess derive from Arnesonian tradition.
The first one is. The last two weren't. I'm not even positive I'll be able to completely archive that first one. Somebody was looking at getting it migrated to groups.io, though I don't know whether they followed through with that.
I just started grabbing messages for that first one. That's the easy part, because I can do it with a script. Not sure I'll get to all the attachments and files and stuff, because it's highly manual and kind of a chore.