Yes, I believe it is essentially the same thing. If you get the ACI/ADI mount on the top ring, you can not use the low rings on a rail if you have a rail base. It will block the rear windage nut. So I opted for just the anti cant level
and rail mounted ADI. The rail mounted one also tucks out of the way a little better.... less protrusive and likely to get caught on brush, etc.
But dont take my word for it, call NF. They will give you the facts.