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Based off this. http://blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility/
I haven't seen anyone using 1:1 and Exact at the same time but am happy to be proven wrong. Maybe it's close enough to work even though they're not designed to match or something.
Edit: maybe you can bodge it by clamping the cable on the wrong side of the bolt etc. but I personally wouldn't bother since both 1:1 and Exact stuff is all really cheap. I personally wouldn't take the risk of incompatibility and would just get the matching one.
I have an 1:1 derailleur at home, I would be happy to try them together with my Exact Actuation shifters tomorrow night or something if anyone is interested.
SRAM say it’s the same so I’d be interested to see where you’ve seen it’s different and why they work perfectly together for so many people if it’s true