There are some threads on Frankenpacks that show KUIU packs on Kifaru frames. IIRC, you'll have to change out the KUIU frame attachment clips. Attachment points are very similar in location.
I have two Exo bags that I use on an older Kufaru duplex frame. The bags are a couple of years old as well (2000 and 5500) but they mount up really well with a Kifaru compression strap kit and some lid buckles I got from Exo. I basically followed the instructions on the frankenpack thread and it worked surprisingly well.
I've got a 6400 on a duplex, but yes it'll work great. Rather than cutting the buckles off the bag like in the frankenpack thread, I swapped the buckles from the kifaru compression straps to match the ones on the bag. Easy peasy.