Well, if the mod is using 2 attys, the effective resistance as far as battery draw is concerned should be half of the average of your attys.
I.e. with two 0.45 attys, your resistance would be somewhere around 0.225
If one atty is 0.46 and the other is 0.44, the outcome would be the same, with the 0.44 heating up slightly quicker.
The closer the resistances on each coil, the more evenly they will fire, just make sure your batteries or mod can handle a build this low.
I don't quite understand why someone would want a mod with two attys other than as a gimmick, but whatever floats your boat
