It appears that the generation 2 parka has a bigger cut, no liner and cordura on the elbows but I can't devise anything else. I thought at first that generation 1 did not have arm pit ventilation zippers but I think it does.
I can see cargo pockets, belt loops and cordura nylon reinforcements but that's it.
It's hard to find information on this stuff at times. I can often find plenty of information for things well outside of my budget though!
Anyways, I'm trying to find a generation 2 ecwcs parka but it's hard to pick though the differences between the first generation which I hear is not worth it via this forum.
I have a pair of generation 1 pants which I hope will suffice but I would really like to go for the generation 2 parka. If this came up somewhere on the forum I apologize, I could not find it though.