what is best way to imitate Samsung's phone on my Motorola Moto X2 2nd gen?

You can look for a modded APK of the camera (like people are doing with Google's Pixel Camera), BUT that is no guarantee that it'll work, especially since camera modes might require special hardware or hardware access that your device might not have (like Super Slo-Mo or access to manual controls).
 
Have someone with a Samsung make an .apk file of the camera (App Backup & Restore will do that). I went from a Samsung to a Pixel, so the Samsung phone came over to the Pixel 2. I tried it against the Pixel's camera - the Pixel camera is much better (I especially like the HDR+ mode).
 

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