Can I separate my Google Play and Amazon Appstore Apps within Unity?

I am planning on making two builds of my game, one for Google Play store and one for Amazon App Store. I have code that will be specific to each build ( Achivements will be either Google Play Services or Gamecircle, More Games will link to apps within the relevant appstore ).

Preferably I would like a way so I have them appear as two platforms within Unity, so that I can basically switch between Android - Google Play and Android - Amazon Appstore?

I'm aware I could change a Scripting Define Symbol then use that to decide which code to use, but is there a more elegant solution I could use?