I'm sorry, you're not being very clear. What exactly are you doing? Installing the same CIA file on 2 different consoles?
Yeah sorry, I realize I'm not very good at explaining this. Lemme rephrase.
-Both my sister and I want to play Moon. I personally have a 32 GB card with an EmuNAND set up on it, and already got the game via Freeshop. The console is a 2DS.
-My sister wants to get her own SD, set up an EmuNAND on it, and use it on said 2DS as well.
The question is : will both NANDs have the same header as a result, making it impossible to both play Moon ?