Sorry, wan't clear on my comment on the domestic/Int being the same.

I meant are they the same when it comes to the row on the right side of the plane having 2 seats and lots of leg room. Row 6 on the ETOPs and 8/9 on the other two variations according to seat guru. Same open space in front?

You should only be able to book those early as a preffered memeber so boarding early shouldn't be too much of an issue provided the airport does it as prescribed.