Possible to screen mirror from Galaxy S4 to Galaxy S5?

[AC Question]

I want to mirror my Samsung Galaxy S4 to my Galaxy S5 for a project I am working on. It is possible to do this? I know you can Mirror from the phone to a TV, but I have not come across a way to mirror from phone to phone. Is there an app or a certain way to this without a WiFi Router involved? I was hoping to do it via bluetooth or 3g/4g possibly?

Thank a lot for your help guys!