It's the same question as: "two units attack a single province from two different provinces, both units are identical, (0 star generals), which one is chosen as the general?".
Whoever is chosen as the general also determines the border lands chosen for the staging of the battle. It's not clear as to who would be chosen, but if the game engine cannot use command stars then it must have to choose the general based on other generals' stats... if those are also equal then the unit quality would presumably determine which unit leads the army, if both units are the same then the ages of the generals involved may factor in, if both units were trained on the same year, then there is always the campmap province ID... if the game engine could not decide then the game would crash, so there has to be "fail safes" for this.
I would concur with drone, that the best approach would be for you to test it and post your findings...
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